Lecture 23 Histology of the Ear

Question 1

Auricle

Answer 1

Pinna of the ear and the auditory canal

Integument overlying elastic cartilage

Question 2

Describe the Integument of the Auricle

Answer 2

Thin, keratinized stratified squamous epithelium

Hair follicles can be observed in the dermis

Question 3

Outer third of the ear canal is composed of:

Answer 3

elastic cartilage

Question 4

Inner two thirds of the ear canal is composed of:

Answer 4

bone

Question 5

What type of epithelium lines the ear canal and what type of glands does it contain?

Answer 5

Stratified squamous epithelium

Sebaceous and ceruminous glands (modified sebaceous glands)

Question 6

Tympanic membrane

Answer 6

Separates the external auditory canal from the middle ear
Core is formed from vascularized, innervated connective tissue
External surface is covered by thin skin
Internal surface is covered by simple cuboidal epithelium

Question 7

Name the auditory ossicles of the middle ear

Answer 7

Malleus (hammer)
Incus (anvil)
Stapes

Question 8

Malleus (hammer)

Answer 8

Attached to the tympanic membrane

This bone is so-named because it articulates with the “anvil”

Question 9

Incus (anvil)

Answer 9

Intermediate bone between the stapes and the malleus

“Incus” refers to an anvil, on which the hammer strikes

Question 10

Stapes

Answer 10

So-named because it is shaped like a stirrup due to the opening for the stapedial artery
Inserts onto the oval window

Question 11

Openings of the Middle Ear

Answer 11

Oval Window

Round Window

Question 12

Oval Window

Answer 12

Stapes attaches to the membrane covering the oval window

Opens into the scala vestibuli

Question 13

Round Window

Answer 13

Membrane-covered region at the end of the scala tympani

Question 14

Muscles of the Middle Ear

Answer 14

Tensor Tympani

Stapedius

Question 15

Tensor Tympani

Answer 15

Inserts on the malleus

Question 16

Stapedius

Answer 16

Inserts on the stapes