Middle Ear Structure

Question 1

What is the lateral border of the Tympanic Cavity?

Answer 1

The Tympanic Membrane

Question 2

What is the medial border of the Tympanic Cavity?

Answer 2

Oval & Round Windows of the cochlea

Question 3

Eustachian tube connects to what?

Answer 3

Connects the middle ear to the Nasopharynx.

Question 4

What is the function of the Eustachian Tube?

Answer 4

Equalize pressure in the middle ear

Question 5

What happens if there is an Occlusion in the Eustachian Tube?

Answer 5

Can’t equalize pressure

Tympanic membrane may retract.

Question 6

What are the ossicles?

Answer 6

The Malleus (Lateral)
The Incus (Middle) 
The Stapes (Medial)
**Suspended by ligaments & joined by synovial membranes.

Question 7

What is the function of the ossicles?

Answer 7

Transmit vibratory motion of the eardrum to the oval window (inner ear).

Question 8

What are the 2 muscles in the middle ear that contract reflexively in response to loud sounds to prevent damage?

Answer 8

1. Tensor Tympani

2. Stapedius