Structure of the human ear
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The human ear is divided into three parts named as:
● Outer Ear;
● Middle Ear; and
● Inner Ear
● The external ear is composed of pinna, auditory meatus and tympanic membrane. Pinna is a cartilage covered with skin and is effective in collecting sound waves. Auditory meatus is a narrow canal which have hair lining and wax secreting glands in it. The tympanic membrane separates the external ear from the middle ear and is also called ear, it helps in transferring vibrations of sound waves to the middle ear.
● The middle ear is comprised of tympanic cavity, ear ossicles and two skeletal muscles. The 3 year ossicles are small flexible bones which are incus, malleus and stapes. The skeletal muscles are tympani and stapedius.
● The inner ear has three semicircular ducts named as anterior, posterior and Lateral semicircular ducts. End of each duct forms an ampulla. Then comes the Utricle to which the three ducts are attached. Then is the saccule which is a ventricular structure. The Endolymphatycus is a long duct tube which ends blindly as Saccus Endolymphatycus.
The Cochlea is a snail shaped structure which is the main hearing organ. It has three fluid filled cavities.
Scala Vestibuli and Scala Tympani are filled with perilymph and scala media is filled with endolymph.
The organ of Corti has sensory hair projections present outside it.