Ear/Eye Histology

Question 1

Auricle

Answer 1

outer ear; also called pinna

Question 2

S-shaped tube that leads to the tympanic membrane; lined with stratified squamous epithelium

Answer 2

External Auditory Meatus

Question 3

Bones of the ossicles

Answer 3

malleus, incus, stapes

Question 4

Contains the tympanic cavity (air-filled space in temporal bone)

Answer 4

middle ear

Question 5

Connects middle ear cavity to nasopharynx

Answer 5

auditory tube

Question 6

How does the middle ear becoming infected in otitis media

Answer 6

infections can travel from throat to middle ear though the auditory tube

Question 7

Location of semicircular canals and cochlea

Answer 7

inner ear

Question 8

Structure responsible for balance and acceleration

Answer 8

semicircular canals

Question 9

Structure responsible for hearing in the ear

Answer 9

cochlea

Question 10

Bony canal in temporal bone containing semicircular canals and cochlea

Answer 10

osseous labyrinth

Question 11

Tucked inside osseous labyrinth. Contains sensory organs

Answer 11

Membranous labyrinth

Question 12

Fluid between the osseous and membranous labyrinth

Answer 12

perilymph

Question 13

fluid within the membranous labyrinth

Answer 13

endolymph

Question 14

Located within cochlear duct. Consists of hair cells supported on basilar membrane. Stereocilia on hair cells project into overlying gel-like tectorial membrane

Answer 14

Organ of Corti

Question 15

Stereocilia movement inside what membrane causes nerve signal in cochlear division of CN VIII

Answer 15

tectorial membrane

Question 16

Membrane which vibrates to move stereocilia in hearing

Answer 16

basilar membrane

Question 17

Sense organ responsible for static equilibrium

Answer 17

macula (in utricle/saccule)

Question 18

Sense organ responsible for dynamic equilibrium

Answer 18

crista ampullaris (in semicircular ducts)

Question 19

The utricle and saccule detect…

Answer 19

the static position and linear acceleration of the head

Question 20

Detect rotational movements of the head

Answer 20

semicircular canals. Specific sense organ is the crista ampullaris

Question 21

Tunics / Layers of the eye

Answer 21

• Outer fibrous layer
• Middle Vascular Layer
• Inner sensory layer

Question 22

Transition between sclera and cornea

Answer 22

limbus

Question 23

Components of outer fibrous layer of the eye

Answer 23

sclera and cornea

Question 24

Components of the middle vascular layer of the eye

Answer 24

choroid, ciliary body, and iris

Question 25

Components of the inner sensory layer of the eye

Answer 25

retina

Question 26

Attachment site of tendons of extraocular muscles

Answer 26

sclera

Question 27

Five layers of the cornea from superficial to deep

Answer 27

1) Corneal epithelium
2) Bowman’s layer (basement membrane)
3) Stroma
4) Descemet’s Membrane
5) Endothelium

Question 28

Posterior cavity of the eye

Answer 28

vitreous chamber of the eye

Question 29

Anterior cavity of the eye

Answer 29

• Anterior Chamber: between cornea and the iris

* Posterior Chamber: between the iris and the lens

Question 30

Projection of choroid and retina. Includes ciliary muscle and processes.

Answer 30

Ciliary body

Question 31

Functions of the ciliary body

Answer 31

1) accommodation

2) production of aqueous humor

Question 32

Two layers of epithelial cells covering ciliary processes

Answer 32

1) superficial (not pigmented)

2) deep cells (pigmented)

Question 33

What attaches lens to the ciliary body

Answer 33

zonular fibers

Question 34

3 layers of cell bodies in the retina

Answer 34

1) cone or rod cell
2) bipolar cell
3) ganglion cell

Question 35

Area of highest visual acuity on the retina. Lateral to the optic disc

Answer 35

Fovea centralis