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Embryology and Anatomy of Ear

Question
48 out of 70
 

Crus commune is in:



A Cochlea
B Middle ear

C Behind retina
D Part of lens

Ans. A Cochlea Ref. Dhingra 6th/ed p 10, 5th/ed p 11

Semicircular Canals

There are 3 semicircular canals - the lateral, posterior and superior which lie in a plane of right angles to one another

5.jpg

Each canal has an ampullated end which opens independently into the vestibule and a non ampullated end Superior S.C.C

The non-ampullated ends of posterior and superior canals unite to form a common channel called the crus commune.

So the three canals open into the vestibule by 5 openings. Thus actually crus commune-is a part of semicircular canals but since this option is not given, we are taking the next best option. cochlea.

Also Remember

Crista ampullaris: It is located in the ampullated end of the three semicircular duct and is a receptor which responds to angular acceleration.

Utricle and saccule lie in the bony vestibule, together they are called the otolith organ. Their sensory epithelium is called as Macula which responds to linear acceleration and deceleration

Embryology and Anatomy of Ear Flashcard List

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