What are the four initial stages of the embryonic development ?

What are the four initial stages of the embryonic development ?
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The four initial stages of the embryonic development are the morula stage, the blastula stage, the gastrula stage, and the neurula stage.   
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What are the four initial stages of the embryonic development ?

Description : What are the four initial stages of the embryonic development ?

Last Answer : The four initial stages of the embryonic development are the morula stage, the blastula stage, the gastrula stage, and the neurula stage.

How are animals classified according to the germ layers present in their embryonic development ?

Description : How are animals classified according to the germ layers present in their embryonic development ?

Last Answer : Cnidarians are diploblastic, i.e., they present only endoderm and ectoderm. With the exception of poriferans, all remaining animals are triploblastic. Poriferans do not present differentiated tissue ... not classify regarding germ layers (although sometimes they are mentioned as diploblastic).

What is the cell division during the first stage of the embryonic development called ?

Description : What is the cell division during the first stage of the embryonic development called ?

Last Answer : How is this stage characterized? The cell division in the first stage of the embryonic developments is called cleavage, or segmentation. In this stage, mitosis occurs from the zygote forming the new embryo.

What are the cells produced in the first stage of the embryonic development called ?

Description : What are the cells produced in the first stage of the embryonic development called ?

Last Answer : The cells that resulted from the cleavage (the first stage of the embryonic development) are called blastomeres. In this stage the embryo is called morula (similar to a “morus”, mulberry).

After the blastula stage what is the following stage of the embryonic development ?

Description : After the blastula stage what is the following stage of the embryonic development ?

Last Answer : How is the passage from blastula to the next stage called? The blastula turns into gastrula in a process known as gastrulation.

What is the chorioallantois membrane present in the embryonic development of reptiles and birds ?

Description : What is the chorioallantois membrane present in the embryonic development of reptiles and birds ?

Last Answer : How does this membrane participate in the energetic metabolism of the embryo? The chorioallantois membrane is formed by juxtaposition of some regions of the chorion and the allantois. Since it is ... of gases between the embryo and the exterior thus making aerobic cellular respiration possible.

How are animals classified according to the germ layers present in their embryonic development ?

Description : How are animals classified according to the germ layers present in their embryonic development ?

Last Answer : Cnidarians are diploblastic, i.e., they present only endoderm and ectoderm. With the exception of poriferans, all remaining animals are triploblastic. Poriferans do not present differentiated tissue ... not classify regarding germ layers (although sometimes they are mentioned as diploblastic).

After the blastula stage what is the following stage of the embryonic development ?

Description : After the blastula stage what is the following stage of the embryonic development ?

Last Answer : How is the passage from blastula to the next stage called? The blastula turns into gastrula in a process known as gastrulation. Image Diversity: gastrula

What are the cells produced in the first stage of the embryonic development called ?

Description : What are the cells produced in the first stage of the embryonic development called ?

Last Answer : The cells that resulted from the cleavage (the first stage of the embryonic development) are called blastomeres. In this stage the embryo is called morula (similar to a “morus”, mulberry). Image Diversity: morula

What is the cell division during the first stage of the embryonic development called ?

Description : What is the cell division during the first stage of the embryonic development called ?

Last Answer : How is this stage characterized? The cell division in the first stage of the embryonic developments is called cleavage, or segmentation. In this stage, mitosis occurs from the zygote forming the new embryo.

What is the cell division process directly related to the embryonic growth ?

Description : What is the cell division process directly related to the embryonic growth ?

Last Answer : The embryonic growth depends directly on mitosis. Through this type of cell division, the zygote divides itself giving birth to a series of cells that by mitosis too compose differentiated tissues and organs until the formation of a complete individual.

Which is the extra embryonic membrane whose function is to store nitrogen wastes of the embryo ?

Description : Which is the extra embryonic membrane whose function is to store nitrogen wastes of the embryo ?

Last Answer : Is this function present in placental mammalian embryos? The allantois is the extra embryonic membrane whose function is to store excretes of the embryo. In placental mammals, the allantois is present ... wastes are collected by the mother's body through the placenta. Image Diversity: allantois

Are the extra embryonic membranes the same in all vertebrates ?

Description : Are the extra embryonic membranes the same in all vertebrates ?

Last Answer : The presence of each extra embryonic membrane varies according to the vertebrate class. In fishes and amphibians, only the yolk sac is present. In reptiles and aves besides the yolk sac, there ... and the allantois. In placental mammals besides all these membranes, the placenta is present too.

What are the extra embryonic membranes present in vertebrates ?

Description : What are the extra embryonic membranes present in vertebrates ?

Last Answer : The extra embryonic membranes that may be present in vertebrates are the yolk sac, the amnion, the chorion, the allantois and the placenta.

What are extra embryonic membranes ?

Description : What are extra embryonic membranes ?

Last Answer : Extra embryonic membranes are membranous structures that appear paralleling the embryo and play important roles in the embryonic development. They form from the embryo but do not become part of the individual organism after its birth.

What is the cell division process directly related to the embryonic growth ?

Description : What is the cell division process directly related to the embryonic growth ?

Last Answer : The embryonic growth depends directly on mitosis. Through this type of cell division, the zygote divides itself giving birth to a series of cells that by mitosis too compose differentiated tissues and organs until the formation of a complete individual.

What are histogenesis and organogenesis ?

Description : What are histogenesis and organogenesis ?

Last Answer : Histogenesis is the process of tissue formation in the embryonic development. Organogenesis is the process of organ formation. Before histogenesis and organogenesis the primitive embryonic structures have been already formed: germ layers, neural tube, notochord, coeloms, somites.

What are somites ?

Description : What are somites ?

Last Answer : Somites are differentiated portions of mesodermal tissue longitudinally distributed along the embryo. The somites originate the muscle tissue and portions of the connective tissues.

After the neurula stage and from its ventral portion to the dorsal how can the morphology of the embryo be described ?

Description : After the neurula stage and from its ventral portion to the dorsal how can the morphology of the embryo be described ?

Last Answer : In a schematic longitudinal section of the embryo after the neurula stage, the outermost layer of cells is the ectoderm. In the ventral region comes the archenteron tube formed of endodermal cells. In both ... is the notochord. In the dorsal region just above the notochord lies the neural tube.

What are pleura ?

Description : What are pleura ?

Last Answer : pericardium, and peritoneum? Pleura are the membrane that covers the lungs and the inner wall of the chest; pericardium is the membrane that covers the heart; peritoneum is the membrane that ... tract and part of the abdominal cavity. All these membranes delimit coeloms (internal cavities).

What is the germ layer from which the coeloms originate ?

Description : What is the germ layer from which the coeloms originate ?

Last Answer : The coeloms are originated from mesoderm.

What is coelom ?

Description : What is coelom ?

Last Answer : To which structures do coeloms give birth? Are all animals coelomate? Coeloms are cavities delimited by mesoderm. Coeloms originate the cavities where the internal organs of the body are ... animals, there are acoelomate animals, like platyhelminthes, and pseudocoelomate animals, like nematodes.

What is notochord ?

Description : What is notochord ?

Last Answer : How is this structure formed? Notochord is a rodlike structure that forms the supporting axis of the embryo and gives birth to the vertebral column in vertebrates. It is formed by differentiation of mesodermal cells.

How does the embryo turn from gastrula into neurula ?

Description : How does the embryo turn from gastrula into neurula ?

Last Answer : How is the neural tube formed? What is the embryonic origin of the nervous system in vertebrates? The neurula stage is characterized by the appearing of the neural tube along the dorsal region of the ... the nervous system is the ectoderm (the same germ layer that gives birth to the skin).

What is the function of the vitellus in the vertebrate egg ?

Description : What is the function of the vitellus in the vertebrate egg ?

Last Answer : How are these eggs classified according to the amount of vitellus within them? Vitellus (yolk) is the nutritive material that accumulates in the cytoplasm of the egg (zygote) with the function of ... yolk diffusely distributed) and telolecithal (more yolk concentrated in one end of the egg).

What are the animal pole and the vegetal pole of the vertebrate egg ?

Description : What are the animal pole and the vegetal pole of the vertebrate egg ?

Last Answer : The animal pole of a telolecithal egg is the portion of the egg with little vitellus, it is opposite to the vegetal pole that is the region where the yolk is concentrated.

After the morula stage what is the next stage ?

Description : After the morula stage what is the next stage ?

Last Answer : What is the morphological feature that defines that stage? After passing the morula stage in which the embryo was a compact mass of cells, the next stage is the blastula stage. In the blastula stage, the compactness is lost and an internal cavity filled with fluid appears inside, the blastocele.

What is gastrulation ?

Description : What is gastrulation ?

Last Answer : How during gastrulation are the first two germ layers formed? Which are these germ layers? Gastrulation is the process through which a portion of the blastula wall undergoes invagination inside the ... germ layer). It is the beginning of the tissue differentiation in the embryonic development.

What are the archenteron and the blastopore ?

Description : What are the archenteron and the blastopore ?

Last Answer : What is the stage of the embryonic development in which these structures are formed? What are the destinations of the archenteron and of the blastopore? Archenteron is the tube formed during gastrulation ... the digestive tube: the mouth in protostome beings, or the anus in deuterostome beings.

What are the three types of germ layers that form tissues and organs in animals ?

Description : What are the three types of germ layers that form tissues and organs in animals ?

Last Answer : The three germ layers are the ectoderm, the mesoderm, and the endoderm. 39. How is the mesoderm (third germ layer) of triploblastic animals formed? The mesoderm appears from differentiation of endodermal cells that cover the dorsal region of the archenteron.

What is the function of the umbilical cord ?

Description : What is the function of the umbilical cord ?

Last Answer : The umbilical cord is a set of blood vessels that connect the fetus with the placenta. In the fetus, one extremity of the cord inserts into the center of the abdominal wall (the later scar of this insertion is the umbilicus).

What are the endocrine functions of the placenta ?

Description : What are the endocrine functions of the placenta ?

Last Answer : The placenta has endocrine function since it secretes the hormones progesterone and estrogens that maintain the endometrium (internal covering of the uterus) and prevent menses during pregnancy. The placenta also secretes other important hormones for pregnancy regulation.

Is there exchange of cells between the mother and the fetus through the placenta ?

Description : Is there exchange of cells between the mother and the fetus through the placenta ?

Last Answer : Under normal conditions, there is no passage of cells across the placenta during gestation. The placenta has a smooth mucosa separating the richly vascularized region in contact with the mother ... placental barrier forbids the passage of cells. Image Diversity: umbilical cord placental barrier

What are the main substances transferred from the mother to the fetus through the placenta and from the fetus to the mother ?

Description : What are the main substances transferred from the mother to the fetus through the placenta and from the fetus to the mother ?

Last Answer : From the mother to the fetus the main transferred substances through the placenta are water, oxygen, nutrients, and antibodies. From the fetus to the mother, metabolic wastes including urea (nitrogen waste), and carbon dioxide are transferred.

In which type of animals does the placenta exist ?

Description : In which type of animals does the placenta exist ?

Last Answer : What is its main function? True placenta is present in placental mammals. The placenta is formed from the chorion of the embryo and from the mother's endometrium. Its main function is to allow ... of substances between the fetus and the mother's body. Image Diversity: placenta placental mammals

Why can the amnion also be considered an adaptation to terrestrial life ?

Description : Why can the amnion also be considered an adaptation to terrestrial life ?

Last Answer : The amnion is also an adaptation to dry land since one of its functions is to prevent desiccation of the embryo.

What is the difference between amnion and chorion ?

Description : What is the difference between amnion and chorion ?

Last Answer : Amnion is the membrane that covers the embryo. Chorion is the membrane that covers the amnion, the yolk sac, and the allantois. The space delimited by the chorion and the amnion is ... desiccation of the embryo and of protecting it against mechanical shocks. Image Diversity: amnion chorion

Why can the allantois be considered an adaptation to terrestrial life ?

Description : Why can the allantois be considered an adaptation to terrestrial life ?

Last Answer : The allantois is an adaptation to dry land because in embryos of oviparous terrestrial beings, like reptiles and birds, the metabolic residuals cannot be immediately excreted to the aquatic surrounds ... then the appearing of a structure capable of storing the embryonic excretes until hatching.

How is the yolk sac formed ?

Description : How is the yolk sac formed ?

Last Answer : What is the function of the yolk sac? The yolk sac is formed from the covering of the vitellus by some cells originated from the primitive gut. The yolk sac stores vitellus, the main nourishment source of nonplacental embryos. Image Diversity: yolk sac

What is polyembryony ?

Description : What is polyembryony ?

Last Answer : Polyembryony is the phenomenon in which a single embryo in its initial embryonic stage divides itself forming many new individuals of the same sex and genetically identical. This is the way, for ... place in armadillos of the genus Dasypus. Polyembryony is an example of natural cloning .

What are twins ?

Description : What are twins ?

Last Answer : Genetically what are the two types of twins that can be generated? Twins are simultaneously generated (within the mother's uterus) offspring. Twins classify according to zygosity as monozygotic or as ... genetically identical and they are not necessarily of the same sex. Image Diversity: twins

What are histogenesis and organogenesis ?

Description : What are histogenesis and organogenesis ?

Last Answer : Histogenesis is the process of tissue formation in the embryonic development. Organogenesis is the process of organ formation. Before histogenesis and organogenesis the primitive embryonic structures have been already formed: germ layers, neural tube, notochord, coeloms, somites.

What are somites ?

Description : What are somites ?

Last Answer : Somites are differentiated portions of mesodermal tissue longitudinally distributed along the embryo. The somites originate the muscle tissue and portions of the connective tissues. Image Diversity: somites

After the neurula stage and from its ventral portion to the dorsal how can the morphology of the embryo be described ?

Description : After the neurula stage and from its ventral portion to the dorsal how can the morphology of the embryo be described ?

Last Answer : In a schematic longitudinal section of the embryo after the neurula stage, the outermost layer of cells is the ectoderm. In the ventral region comes the archenteron tube formed of endodermal cells. In both ... is the notochord. In the dorsal region just above the notochord lies the neural tube.

What are pleura ?

Description : What are pleura ?

Last Answer : pericardium, and peritoneum? Pleura are the membrane that covers the lungs and the inner wall of the chest; pericardium is the membrane that covers the heart; peritoneum is the membrane ... . All these membranes delimit coeloms (internal cavities). Image Diversity: pleura pericardium peritoneum

What is the germ layer from which the coeloms originate ?

Description : What is the germ layer from which the coeloms originate ?

Last Answer : The coeloms are originated from mesoderm.

What is coelom ?

Description : What is coelom ?

Last Answer : To which structures do coeloms give birth? Are all animals coelomate? Coeloms are cavities delimited by mesoderm. Coeloms originate the cavities where the internal organs of the body are ... animals, like platyhelminthes, and pseudocoelomate animals, like nematodes. Image Diversity: coelom

What is notochord ?

Description : What is notochord ?

Last Answer : How is this structure formed? Notochord is a rodlike structure that forms the supporting axis of the embryo and gives birth to the vertebral column in vertebrates. It is formed by differentiation of mesodermal cells.

How does the embryo turn from gastrula into neurula ?

Description : How does the embryo turn from gastrula into neurula ?

Last Answer : How is the neural tube formed? What is the embryonic origin of the nervous system in vertebrates? The neurula stage is characterized by the appearing of the neural tube along the dorsal region of the ... the ectoderm (the same germ layer that gives birth to the skin). Image Diversity: neurula

What are the three types of germ layers that form tissues and organs in animals ?

Description : What are the three types of germ layers that form tissues and organs in animals ?

Last Answer : The three germ layers are the ectoderm, the mesoderm, and the endoderm. Image Diversity: germ layers