Ear

Question 1

Perilymph

Answer 1

The fluid in the bony labyrinth

resembles extracellular fluid (and CSF) in composition (high Na+ and low K+).

Question 2

Endolymph

Answer 2

The fluid of the membranous labyrinth

Similar in composition to intracellular fluid (low Na+ and high K+).

Question 3

a nerve impluse is caused deflection of stereocilia within crista ampullaris during

Answer 3

angular acceleration of the head

Question 4

Semicircular Canal

Answer 4

➢ The anterior, posterior, and lateral
semicircular canals
➢ Attached to the vestibule by an
expanded ampulla
➢ The membranous labyrinth within is
semicircular duct

Question 5

Crista Ampullaris

Answer 5

➢ Contained within ampulla
➢ Cupula-gelatinous protein-polysaccharide mass
➢ Attached to each crista
➢ Cupula projects into lumen
➢ Surrounded by endolymph

Question 6

Maculae

Answer 6

➢ Contained within utricle & saccule
➢ Sensors of gravity and linear acceleration of head
➢ Cells of the epithelium face the endolymph
➢ Gelatinous polysaccharide material over the epithelium –otolithic membrane
(OM)
➢ Outer aspect of otolithic membrane contain crystalline bodies of calcium
carbonate and protein called “otoconia”

Question 7

cochlea makes two and a half turns around a central cone called a

Answer 7

Modiolus

Question 8

What is responsible for the responsible for the ionic composition of the endolymph is located on the lateral aspect - against the bone.

Answer 8

Stria vascularis

Question 9

Basilar Membrane

Answer 9

separates scala tympani from scala media. Contains neuroepithelial hair cells arranged on its surface. These cells constitute “organ of Corti”

Question 10

Vestibular Membrane (Reissners)

Answer 10

separates the scala media from the scala vestibule.

Question 11

Types of Corneal Transplant

Answer 11

➢ Penetrating keratoplasty
➢ Lamellar keratoplasty
➢ Endothelial keratoplasty

Question 12

Most common detachment occurs at the

Answer 12

junction of pigment epithelial layer and the rods & cones layer.