Histology Of The Ear

Question 1

What are the 3 parts of the outer ear?

Answer 1

Auricle, external auditory meatus, and tympanic membrane

Question 2

Which part of the outer ear is the pinna or the ear and the auditory canal?

Answer 2

Auricle

Question 3

In the auricle, the integument overlies what type of CT?

Answer 3

Elastic cartilage

Question 4

The outer third of the ear canal is composed of what time of CT cartilage?

Answer 4

Elastic

Question 5

The inner 2/3 of the external auditory meatus is composed of what CT?

Answer 5

Bone

Question 6

What type of glands are in the lining of the ear canal?

Answer 6

Sebaceous glands and ceruminous glands

Question 7

What kind of epithelium is the lining of the ear canal?

Answer 7

Stratified squamous epithelium

Question 8

Eardrum aka…

Answer 8

Tympanic membrane

Question 9

The eardrum separates what 2 structures?

Answer 9

Separates the external auditory canal from the middle ear

Question 10

The core in the eardrum has vascularized/innervated/both CT?

Answer 10

Both

Question 11

The external surface of the eardrum is covered by thin/thick skin?

Answer 11

Thin

Question 12

The internal surface of the eardrum is covered by what type of epithelium?

Answer 12

Simple cuboidal

Question 13

Middle ear aka…

Answer 13

Tympanic cavity

Question 14

What are the muscles for the middle ear?

Answer 14

Malleus (hammer), incus (anvil), and stapes

Question 15

What are the 2 openings of the middle ear?

Answer 15

Oval and round window

Question 16

The oval window opens into the…

Answer 16

Scala vestibuli

Question 17

The round window is at the end of the…

Answer 17

Scala tympani

Question 18

What are the muscles of the middle ear? Where do each insert?

Answer 18

Tensor tympani-inserts on the malleus

Stapedius-inserts of the stapes

Question 19

What is the primary function of the muscles of the middle ear?

Answer 19

Respond to loud sounds in order to dampen the vibrations of the auditory ossicles

Question 20

What are the inner ear regions?

Answer 20

Bony labyrinth
Membranous labyrinth
Vestibular organ and
Auditory organ

Question 21

The bony labyrinth is embedded in the __ portion of the temporal bone and is filled with high-sodium content called __?

Answer 21

Embedded in the petrous portion, called perilymph

Question 22

The membranous labyrinth is embedded within the __ of the bony labyrinth and is filled with high-potassium content called __?

Answer 22

Embedded within the chambers of the bony labyrinth, called endolymph

Question 23

Vestibular organs are patches of sensory structures that respond to changes in__?

Answer 23

Position

Question 24

The macuale of saccule and utricle contain what type of epithelium?

Answer 24

Columnar supporting cells and vestibular hair cells

Question 25

The otolithic membrane is actually what type of layer containing calcium carbonate crystals called __ that overlies the epithelium?

Answer 25

A gelatinous layer with crystals called otoliths

Question 26

The cupula is similar to the otolithic membrane but without?

Answer 26

Otoliths

Question 27

The cochlear duct divides the bony cochlea into the?

Answer 27

Scala vestibuli and scala tympani

Question 28

Vestibular membrane forms the __ of the duct

Answer 28

Roof

Question 29

The basilar membrane forms the __ of the duct

Answer 29

Floor

Question 30

Stria vascularis forms the __ aspect of the duct

Answer 30

Lateral aspect

Question 31

Stria vascularis participates in the formation of the?

Answer 31

Endolymph

Question 32

Organ of cori lies on the __ membrane

Answer 32

Basilar