a) The human ear is divided into three parts namely the outer ear, the middle ear and the inner ear. b) The outer ear consists of pinna, auditory canal and the tympanum. c) Pinna is a cartilageneous organ covered with skin. d) Tympanum is an obliquely placed membrane which separates the external ear from the middle ear. e) The middle ear consists of three bones namely malleus, incus and stapes. f) The middle ear is connected to the throat by an air passage called Eustachian tube. g) The inner ear has two parts namely utriculus and sacculus. The upper part or utriculus is connected to semi-circular canals. The lower part or sacculus is connected to cochlea. h) Cochlea has delicate structures called organ of corti, which have receptors that join to
form the auditory nerve.