The light reflex involves the following structures: a. Edinger-Westphal nucleus b. ciliary ganglion c. lateral geniculate body d. oculomotor nerve

The light reflex involves the following structures:
a. Edinger-Westphal nucleus
b. ciliary ganglion
c. lateral geniculate body
d. oculomotor nerve
by

1 Answer

Answer :

Edinger-Westphal nucleus
by

Related questions

The ciliary ganglion: a. is found between the optic nerve and the medial rectus b. contains sympathetic nerve that supplies the sphincter pupillae c. is a parasympathetic relay ganglion for fibers from the Edinger-Westphal nucleus d. contains sensory nerve e. has a motor nerve that goes to the inferior oblique

Description : The ciliary ganglion: a. is found between the optic nerve and the medial rectus b. contains sympathetic nerve that supplies the sphincter pupillae c. is a parasympathetic relay ganglion for fibers from ... nucleus d. contains sensory nerve e. has a motor nerve that goes to the inferior oblique

Last Answer : is a parasympathetic relay ganglion for fibers from the Edinger-Westphal nucleus

The following are true about pupillary reaction to light: a. it is impaired in damage of the Edinger-Westphal nucleus b. it is impaired in damage of the ciliary ganglion c. it is impaired in damage of the superior cervical ganglion d. the pupil does not respond to light with a frequency of greater than 5 H

Description : The following are true about pupillary reaction to light: a. it is impaired in damage of the Edinger-Westphal nucleus b. it is impaired in damage of the ciliary ganglion c. it is impaired in ... cervical ganglion d. the pupil does not respond to light with a frequency of greater than 5 H

Last Answer : the pupil does not respond to light with a frequency of greater than 5 H

Direct light reflex of the pupil is absent in: a. lesion of the ipsilateral ciliary ganglion. b. transaction of the ipsilateral optic nerve. c. bilateral occipital lobe lesion. d. topical application of phenylepherine.

Description : Direct light reflex of the pupil is absent in: a. lesion of the ipsilateral ciliary ganglion. b. transaction of the ipsilateral optic nerve. c. bilateral occipital lobe lesion. d. topical application of phenylepherine.

Last Answer : lesion of the ipsilateral ciliary ganglion.

Instead of depressing, morphine stimulates (a) Vasomotor centre (b) Edinger westphal nucleus (c) Temperature regulating centre (d) Cough centre

Description : Instead of depressing, morphine stimulates (a) Vasomotor centre (b) Edinger westphal nucleus (c) Temperature regulating centre (d) Cough centre

Last Answer : Ans: B

Inhibition of the Edinger-Westphal nucleus: a. causes relaxation of the iris sphincter b. causes contraction of the iris dilator c. occurs in deep sleep d. occurs with narcotics

Description : Inhibition of the Edinger-Westphal nucleus: a. causes relaxation of the iris sphincter b. causes contraction of the iris dilator c. occurs in deep sleep d. occurs with narcotics

Last Answer : causes contraction of the iris dilator

Instead of depressing, morphine stimulates: A. Vasomotor centre B. Edinger Westphal nucleus C. Temperature regulating centre D. Cough centre

Description : Instead of depressing, morphine stimulates: A. Vasomotor centre B. Edinger Westphal nucleus C. Temperature regulating centre D. Cough centre

Last Answer : B. Edinger Westphal nucleus

Differences between the M cells and P cells include: a. M cells have larger cell bodies than P cells b. M cells have slower conduction rate than P cells c. M cells have larger receptive field than P cells d. M cells do not synapse in lateral geniculate body whereas P cells do

Description : Differences between the M cells and P cells include: a. M cells have larger cell bodies than P cells b. M cells have slower conduction rate than P cells c. M cells have larger receptive field than P cells d. M cells do not synapse in lateral geniculate body whereas P cells do

Last Answer : M cells have larger receptive field than P cells

Ablation of the stellate ganglion cuases: a. dilatation of the ipsilateral pupil b. vasodilatation of the ipsilateral arm c. posteral hypotension d. loss of consensual light reflex

Description : Ablation of the stellate ganglion cuases: a. dilatation of the ipsilateral pupil b. vasodilatation of the ipsilateral arm c. posteral hypotension d. loss of consensual light reflex

Last Answer : vasodilatation of the ipsilateral arm

Structures involved in colour vision include: a. parvocellular pathway b. superficial layer 4C of visual cortex c. superior collliculi d. geniculate layers 1-2

Description : Structures involved in colour vision include: a. parvocellular pathway b. superficial layer 4C of visual cortex c. superior collliculi d. geniculate layers 1-2

Last Answer : parvocellular pathway

The following cranial nerves contain parasympathetic outflow arising at the brain stem: a. optic nerve b. oculomotor nerve c. trigeminal nerve d. facial nerve

Description : The following cranial nerves contain parasympathetic outflow arising at the brain stem: a. optic nerve b. oculomotor nerve c. trigeminal nerve d. facial nerve

Last Answer : facial nerve

The cranial nerve that is responsible for muscles that move the eye and lid is the _____________________ nerve. a) oculomotor The oculomotor (III) cranial nerve is also responsible for pupillary constriction and lens accommodation.

Description : The cranial nerve that is responsible for muscles that move the eye and lid is the _____________________ nerve. a) oculomotor The oculomotor (III) cranial nerve is also responsible for pupillary constriction ... (VII) nerve is responsible for salivation, tearing, taste, and sensation in the ear.

Last Answer : a) oculomotor The oculomotor (III) cranial nerve is also responsible for pupillary constriction and lens accommodation.

A person was unable to close his right eye. There is dribbling of saliva from right angle of his mouth and he in unable to make a pout. The probable diagnosis is Options: 1) Bell’s Palsy 2) Trigeminal Neuralgia 3) Optic Nerve Injury 4) Oculomotor Nerve Injury

Description : A person was unable to close his right eye. There is dribbling of saliva from right angle of his mouth and he in unable to make a pout. The probable diagnosis is Options: 1) Bell’s Palsy 2) Trigeminal Neuralgia 3) Optic Nerve Injury 4) Oculomotor Nerve Injury

Last Answer : Correct Answer: 1) Bell’s Palsy

Damage/injury to which nerve causes dilation of pupils: A. Oculomotor B. Ansa cervicalis C. Abducens

Description : Damage/injury to which nerve causes dilation of pupils: A. Oculomotor B. Ansa cervicalis C. Abducens

Last Answer : A. Oculomotor

Cornea is supplied by nerve fibers derived from: a. Trochlear nerve b. Optic nerve c. Trigeminal nerve d. Oculomotor nerve

Description : Cornea is supplied by nerve fibers derived from: a. Trochlear nerve b. Optic nerve c. Trigeminal nerve d. Oculomotor nerve

Last Answer : ANSWER: C  

The following are true about pupil reaction to light: a. secretion of acetylcholine is responsible for pupil dilatation b. constriction of the pupil is mediated by nerve fibres travelling in the short ciliary nerve c. dilatation of the pupil is mediated by nerve fibres travelling in the long ciliary nerve d. the sympathetic nerve innervates the dilator muscles

Description : The following are true about pupil reaction to light: a. secretion of acetylcholine is responsible for pupil dilatation b. constriction of the pupil is mediated by nerve fibres travelling in ... fibres travelling in the long ciliary nerve d. the sympathetic nerve innervates the dilator muscles

Last Answer : the sympathetic nerve innervates the dilator muscles

After 48 hours of a cataract extraction operation, a patient complained of ocular pain and visual loss. On examination, this eye looked red with ciliary injection, corneal oedema and absent red reflex. The first suspicion must be: a. Secondary glaucoma. b. Anterior uveitis. c. Bacterial endophthalmitis. d. Acute conjunctivitis

Description : After 48 hours of a cataract extraction operation, a patient complained of ocular pain and visual loss. On examination, this eye looked red with ciliary injection, corneal oedema and absent red ... a. Secondary glaucoma. b. Anterior uveitis. c. Bacterial endophthalmitis. d. Acute conjunctivitis  

Last Answer : ANSWER: C

Which one of the following pairs of structures distinguishes a nerve cell from other types of cell? (a) Vacuoles and fibres (b) Flagellum and medullary sheath (c) Nucleus and mitochondria (d) Perikaryon and dendrites

Description : Which one of the following pairs of structures distinguishes a nerve cell from other types of cell? (a) Vacuoles and fibres (b) Flagellum and medullary sheath (c) Nucleus and mitochondria (d) Perikaryon and dendrites

Last Answer : d) Perikaryon and dendrites

The parotid gland: a. contains a fascial sheath which is innervated by second cervical nerve b. receives post-ganglionic parasympathetic nerve from the otic ganglion c. contains a duct which opens into the mouth opposite the upper canine tooth d. is composed of serous acini which contribute to the saliva e. is covered by the massenter

Description : The parotid gland: a. contains a fascial sheath which is innervated by second cervical nerve b. receives post-ganglionic parasympathetic nerve from the otic ganglion c. contains a duct which opens ... . is composed of serous acini which contribute to the saliva e. is covered by the massenter

Last Answer : contains a fascial sheath which is innervated by second cervical nerve

Optic nerve axon emerges from: a. Ganglion cells b. Rods and cones c. Amacrine cells d. Inner nuclear layer

Description : Optic nerve axon emerges from: a. Ganglion cells b. Rods and cones c. Amacrine cells d. Inner nuclear layer 

Last Answer : ANSWER: A

The following structures are of ectodermal origin: a. the retina and its retinal pigment epithelium b. iris stroma c. the sclera d. the ciliary muscle e. the corneal stroma

Description : The following structures are of ectodermal origin: a. the retina and its retinal pigment epithelium b. iris stroma c. the sclera d. the ciliary muscle e. the corneal stroma

Last Answer : the retina and its retinal pigment epithelium

Which of the following would be the result of a spinal lesion at the level of C8? A. a reduced brachioradialis reflex B. inability to abduct the shoulder C. loss of sensation over the lateral aspect of the arm D. winging of the scapula E. weakness of finger flexion

Description : Which of the following would be the result of a spinal lesion at the level of C8? A. a reduced brachioradialis reflex B. inability to abduct the shoulder C. loss of sensation over the lateral aspect of the arm D. winging of the scapula E. weakness of finger flexion

Last Answer : Ans: E

Stretch reflex: a. is a monosynaptic reflex with a response time of 1 msec b. originates in the muscle spindle which sends off impulses in type Ia nerve fibres c. is intensified by impulses in the gamma efferent fibres d. all above

Description : Stretch reflex: a. is a monosynaptic reflex with a response time of 1 msec b. originates in the muscle spindle which sends off impulses in type Ia nerve fibres c. is intensified by impulses in the gamma efferent fibres d. all above

Last Answer : all above

The cranial nerve that is responsible for facial sensation and corneal reflex is the _____________________ nerve. a) trigeminal The trigeminal (V) cranial nerve is also responsible for mastication.

Description : The cranial nerve that is responsible for facial sensation and corneal reflex is the _____________________ nerve. a) trigeminal The trigeminal (V) cranial nerve is also responsible for mastication. b) ... The facial nerve is responsible for salivation, tearing, taste, and sensation in the ear.

Last Answer : a) trigeminal The trigeminal (V) cranial nerve is also responsible for mastication.

Gagging reflex is caused by: A. Trigeminal nerve B. Glossopharyngeal C. Facial nerve D. Recurrent laryngeal

Description : Gagging reflex is caused by:  A. Trigeminal nerve  B. Glossopharyngeal   C. Facial nerve  D. Recurrent laryngeal  

Last Answer : B. Glossopharyngeal  

Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions characteristics. (a) C-Aqueous chamber-Reflects the light which does not pass through the lens. (b) D - Choroid - Its anterior part forms ciliary body. (c) A - Retina - Contains photoreceptors, i.e., rods and cones. (d) B - Blind spot-Has only a few rods and cones.

Description : Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions characteristics. (a) C-Aqueous chamber-Reflects the light which does not ... , i.e., rods and cones. (d) B - Blind spot-Has only a few rods and cones.

Last Answer : (c) A - Retina - Contains photoreceptors, i.e., rods and cones.

When light fell on the eye, the pupil: a. does not constrict if the optic nerve is severed b. does not respond if the sympathetic system is not functioning c. does not respond if the cholinergic system is blocked d. does not respond if the pretectal nucleus is damaged

Description : When light fell on the eye, the pupil: a. does not constrict if the optic nerve is severed b. does not respond if the sympathetic system is not functioning c. does not respond if the cholinergic system is blocked d. does not respond if the pretectal nucleus is damaged

Last Answer : does not respond if the pretectal nucleus is damaged

The following are true about electroretinogram: a. the a-wave is produced by the photoreceptors b. the b-wave is produced by the ganglion cells c. c-wave is produced by the retinal pigment epithelium d. different light frequencies can be used to separate rod and cone respons

Description : The following are true about electroretinogram: a. the a-wave is produced by the photoreceptors b. the b-wave is produced by the ganglion cells c. c-wave is produced by the retinal pigment epithelium d. different light frequencies can be used to separate rod and cone respons

Last Answer : he a-wave is produced by the photoreceptors

The following are true about electroretinogram: a. the a-wave is produced by the photoreceptors b. the b-wave is produced by the ganglion cells c. c-wave is produced by the retinal pigment epithelium d. different light frequencies can be used to separate rod and cone response

Description : The following are true about electroretinogram: a. the a-wave is produced by the photoreceptors b. the b-wave is produced by the ganglion cells c. c-wave is produced by the retinal pigment epithelium d. different light frequencies can be used to separate rod and cone response

Last Answer : the a-wave is produced by the photoreceptors

Ptosis and mydriasis are seen in: a. Facial palsy b. Peripheral neuritis c. Oculomotor palsy d. Sympathetic palsy

Description : Ptosis and mydriasis are seen in: a. Facial palsy b. Peripheral neuritis c. Oculomotor palsy d. Sympathetic palsy 

Last Answer : ANSWER: C

The following are true about the dural venous sinuses: a. they have no valve b. the cavernous sinus is closely related to the pituitary gland c. the cavernous sinus has the first two divisions of the trigeminal nerve on its lateral wall d. all above

Description : The following are true about the dural venous sinuses: a. they have no valve b. the cavernous sinus is closely related to the pituitary gland c. the cavernous sinus has the first two divisions of the trigeminal nerve on its lateral wall d. all above

Last Answer : all above

The following are true about the dural venous sinuses: a. they have no valve b. the cavernous sinus is closely related to the pituitary gland c. the cavernous sinus has the first two divisions of the trigeminal nerve on its lateral wall d. all above

Description : The following are true about the dural venous sinuses: a. they have no valve b. the cavernous sinus is closely related to the pituitary gland c. the cavernous sinus has the first two divisions of the trigeminal nerve on its lateral wall d. all above

Last Answer : all above

In testing for mobility, which of the following statement is true:** M07 A. Heavy pressure must sometimes be used to test mobility B. Only lateral mobility is significant in diagnosis and treatment of chronic inflammatory periodontal disease C. Hyper mobility indicates that the tooth supporting structures have been weakened D. During the periodontal examination each tooth should be tested individually for hyper mobility E. Reliance on radiograph is essential

Description : In testing for mobility, which of the following statement is true:** M07 A. Heavy pressure must sometimes be used to test mobility B. Only lateral mobility is significant in ... examination each tooth should be tested individually for hyper mobility E. Reliance on radiograph is essential

Last Answer : D. During the periodontal examination each tooth should be tested individually for hyper mobility

During accommodation for near: a. the spherical aberration of the eye increases b. the ciliary muscle relaxes c. the field of vision decreases d. the amount of light entering the eye increases e. the thickness of the lens increases

Description : During accommodation for near: a. the spherical aberration of the eye increases b. the ciliary muscle relaxes c. the field of vision decreases d. the amount of light entering the eye increases e. the thickness of the lens increases

Last Answer : the thickness of the lens increases

The following structures arise from the first pharyngeal arch: a. common carotid artery b. mandible c. facial nerve d. orbicularis oculi e. temporalis

Description : The following structures arise from the first pharyngeal arch: a. common carotid artery b. mandible c. facial nerve d. orbicularis oculi e. temporalis

Last Answer : mandible

Name the cells/tissues in human body which exhibit ciliary movement. -Biology

Description : Name the cells/tissues in human body which exhibit ciliary movement. -Biology

Last Answer : Macrophages and leucocytes in blood exhibit amoeboid movement.

During accommodation: a. the distance between the lens and the ciliary body is decreased b. the tension in the suspensory ligament is increased c. the tension of the lens capsule is increased d. the refractive power of the lens is increased

Description : During accommodation: a. the distance between the lens and the ciliary body is decreased b. the tension in the suspensory ligament is increased c. the tension of the lens capsule is increased d. the refractive power of the lens is increased

Last Answer : the refractive power of the lens is increased

The following are true about tight junction: a. it forms a barrier to water b. it is found in the blood-aqueous barrier of the ciliary body c. it is found in the blood-retinal barrier at the apex of the retinal pigment epithelium d. all above

Description : The following are true about tight junction: a. it forms a barrier to water b. it is found in the blood-aqueous barrier of the ciliary body c. it is found in the blood-retinal barrier at the apex of the retinal pigment epithelium d. all above

Last Answer : all above

The transparent lens in the human eye is held in its place by (a) ligaments attached to the ciliary body (b) ligaments attached to the iris (c) smooth muscles attached to the iris (d) smooth muscles attached to the ciliary body

Description : The transparent lens in the human eye is held in its place by (a) ligaments attached to the ciliary body (b) ligaments attached to the iris (c) smooth muscles attached to the iris (d) smooth muscles attached to the ciliary body

Last Answer : (a) ligaments attached to the ciliary body

The transparent lens in the human eye is held in its place by (1) ligaments attached to the ciliary body (2) ligaments attached to the iris (3) smooth muscles attached to the iris (4) smooth muscles attached to the ciliary body

Description : The transparent lens in the human eye is held in its place by (1) ligaments attached to the ciliary body (2) ligaments attached to the iris (3) smooth muscles attached to the iris (4) smooth muscles attached to the ciliary body

Last Answer : (1) ligaments attached to the ciliary body

Beta adrenergic blockers lower intraocular tension by: A. Down regulating adenylyl cyclase in ciliary body through reduced activation of β2 adrenoceptors B. Constricting ciliary blood vessels C. Blocking adrenergic action on trabecular meshwork D. Reducing aqueous formation unrelated to beta adrenoceptor mediation

Description : Beta adrenergic blockers lower intraocular tension by: A. Down regulating adenylyl cyclase in ciliary body through reduced activation of β2 adrenoceptors B. Constricting ciliary blood vessels ... action on trabecular meshwork D. Reducing aqueous formation unrelated to beta adrenoceptor mediation

Last Answer : A. Down regulating adenylyl cyclase in ciliary body through reduced activation of β2 adrenoceptors

The site of action of miotics for therapeutic effect in angle closure glaucoma is: A. Canal of Schlemm B. Ciliary body C. Ciliary muscle D. Sphincter pupillae muscle

Description : The site of action of miotics for therapeutic effect in angle closure glaucoma is: A. Canal of Schlemm B. Ciliary body C. Ciliary muscle D. Sphincter pupillae muscle

Last Answer : D. Sphincter pupillae muscle

Beta adrenergic blockers lower intraocular tension by: A. Down regulating adenylyl cyclase in ciliary body through reduced activation of β2 adrenoceptors B. Constricting ciliary blood vessels C. Blocking adrenergic action on trabecular meshwork D. Reducing aqueous formation unrelated to beta adrenoceptor mediation

Description : Beta adrenergic blockers lower intraocular tension by: A. Down regulating adenylyl cyclase in ciliary body through reduced activation of β2 adrenoceptors B. Constricting ciliary blood vessels ... action on trabecular meshwork D. Reducing aqueous formation unrelated to beta adrenoceptor mediation

Last Answer : A. Down regulating adenylyl cyclase in ciliary body through reduced activation of β2 adrenoceptors

The site of action of miotics for therapeutic effect in angle closure glaucoma is: A. Canal of Schlemm B. Ciliary body C. Ciliary muscle D. Sphincter pupillae muscle

Description : The site of action of miotics for therapeutic effect in angle closure glaucoma is: A. Canal of Schlemm B. Ciliary body C. Ciliary muscle D. Sphincter pupillae muscle

Last Answer : D. Sphincter pupillae muscle

Aqueous humour is formed by: a. Epithelium of ciliary body b. Posterior surface of iris c. Lens d. Pars plana

Description : Aqueous humour is formed by: a. Epithelium of ciliary body b. Posterior surface of iris c. Lens d. Pars plana

Last Answer : ANSWER: A

The mechanism by which neostigmine improves contraction of myasthenic muscle involves: A. Repetitive binding of the acetylcholine molecules to the same receptors at the muscle endplate B. Diffusion of acetylcholine released from motor nerve endings to a wider area activating neighbouring receptors C. Activation of motor end-plate receptors by neostigmine molecules themselves D. All of the above

Description : The mechanism by which neostigmine improves contraction of myasthenic muscle involves: A. Repetitive binding of the acetylcholine molecules to the same receptors at the muscle endplate B. Diffusion of ... Activation of motor end-plate receptors by neostigmine molecules themselves D. All of the above

Last Answer : D. All of the above

The mechanism by which neostigmine improves contraction of myasthenic muscle involves: A. Repetitive binding of the acetylcholine molecules to the same receptors at the muscle endplate B. Diffusion of acetylcholine released from motor nerve endings to a wider area activating neighbouring receptors C. Activation of motor end-plate receptors by neostigmine molecules themselves D. All of the above

Description : The mechanism by which neostigmine improves contraction of myasthenic muscle involves: A. Repetitive binding of the acetylcholine molecules to the same receptors at the muscle endplate B. Diffusion of ... Activation of motor end-plate receptors by neostigmine molecules themselves D. All of the above

Last Answer : D. All of the above

True statement about the facial nerve include: a its nucleus is in the floor of the fourth ventricle b. its fibres reach the surface of the brain in the cerebellopontine angle c. transmits taste fibres for the anterior half of the tongue d. all above

Description : True statement about the facial nerve include: a its nucleus is in the floor of the fourth ventricle b. its fibres reach the surface of the brain in the cerebellopontine angle c. transmits taste fibres for the anterior half of the tongue d. all above

Last Answer : all above

Put the following structures in order from smallest to biggest, Chromosome, Genome, Nucleotide Base, Codon, Gene, Cell Nucleus?

Description : Put the following structures in order from smallest to biggest, Chromosome, Genome, Nucleotide Base, Codon, Gene, Cell Nucleus?

Last Answer : The order is nitrogenous base, nucleotide, codon, gene, chromosome, nucleus, and cell. :)

DNA in the nucleus is found in structures called?

Description : DNA in the nucleus is found in structures called?

Last Answer : chromosomes

What is the threadlike structures in the nucleus of cells that contain genes?

Description : What is the threadlike structures in the nucleus of cells that contain genes?

Last Answer : Feel Free to Answer