EAR// Sense Organ

Ear is the sense organ helps in sensory perception of hearing and helps in the balancing of the body .
It has three parts : External ear , middle ear and inner ear .

1. SENSE ORGAN : EAR Represented by MEHBUB ALAM BSc Nursing ADWIKA INSTITUTE OF NURSING

2. EAR Human ear is a sense organ of hearing and equilibrium , that detects and analyses sound by transduction (the conversion of sound waves into electrochemical impulse) and maintaining the sense of balance(equilibrium). PARTS OF EAR Human ear is divided into three parts that is:- External ear Middle ear Inner ear

3. PARTS OF EAR External ear:- It is consist of pinna and external auditory meatus. Middle ear- Tympanic membrane (ear drum) or tympanum:-It is consists of skin(outside), connetive tissue (middle), and mucous membrane (inner side). Eustachian tube:-It is also called pharyngotympanic tube. Its helps to equalization of pressure on two side of tympanic membrane. Ear ossicles :-It is also known as auditory ossicle Maleus (Hammer) Incus(Anvil) Stapes(Stirrup) Windows :-Oval windows Rounded windows

4. Parts of human ear:-

5. 3. INNER EAR:- Vestibular apparatus:-It helps to equilibrium of the body. -It is consists of - Otolith organ Semicircular canal Semicircular duct Cochlea:-It is consists of two membranes that is- Reissner’s Basilar

6. Cochlea :- There are tree cavity that is – - Scala vestibuli - Scala media -Scala tympani Fluid present inside the Cochlea:- -Perilymph:-present in the scalatympani and scala vestibuli - Endolymph :-present within scala media

7. Organ corti :- It is present above scala tympani or on the top of the basilar membrane in the scala media. It is peripheral receptors of sense of hearing. Important components of organ of corti :- -Rods of corti -Hair cell -Supporting cells -Tectorial membraine

8. Nerve supply of Ear cells :- Cochlear division of 8 cranial nerve.

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