Anatomy of Ear: Inner Ear

_____ joins the membranous labyrinth between the cochlea and the utricle.

a). Ampullae

b). Endolymphatic sac

c). Cochlear aqueduct

d). Ductus reuniens

Clinical Audiology

Generally the term speech frequencies refers to __________

a). 500, 1000 and 2000 Hz

b). 300 Hz to 3000 Hz

c). 250 Hz to 4000 Hz

d). 250, 500, 1000 and 4000 Hz

e). 20 to 20000 Hz

correct answer: a

Anatomy of Ear: Tympanic Membrane

The tympanic membrane is placed in the canal at an angle of _____ degrees with the floor.

a). 30

b). 45

c). 55

d).135

e).150

correct answer: c

Tympanic membrane is a thin semi-transparent membrane which separates middle ear from the external ear. It is made up of three layers of tissues, i.e. outer epithelial layer, middle fibrous layer and inner mucous layer. It is oval in shape and measures approximately 10 mm vertical plane and and 9 mm in horizontal plane. It is obliquely placed at the end of the ear canal at an angle of about 55° with the floor of the meatus.