Middle Ear (week 3)

Question 1

What two branches of the External carotid artery supply blood to the External ear

Answer 1

Posterior Auricular and Superficial Temporal

Question 2

What branch of the Maxillary artery supplies blood to external ear

Answer 2

Deep Auricular

Question 3

All branches of arteries that supplies blood to external ear

Answer 3

Deep Auricular, Superficial Temporal and Posterior Auricular

Question 4

two parts that make up the tympanic membrane

Answer 4

Flaccid part and Tense part

Question 5

Where is the flaccid part of the tympanic membrane in relation to the tense part?

Answer 5

Superior

Question 6

What innervates the external portion of the tympanic membrane

Answer 6

1. Cervical Plexus - Great Auricular
2. CN V3 - Auriculotemporal n.
3. Cn VII, X - Small auricular branches

Question 7

What innervates the internal portion of the tympanic membrane

Answer 7

CN IX - Tympanic Plexus

Question 8

What does the Tegmen Tympani do?

Answer 8

Separates middle ear from middle cranial fossa

Question 9

What does the floor of the middle ear do?

Answer 9

Separates middle ear from internal jugular vein

Question 10

What is in the lateral portion of the middle ear

Answer 10

Chorda Tympani, Tympanic membrane and Epitympanic recess

Question 11

What is contained in the medial wall of the middle ear

Answer 11

Promontory, Tympanic Plexus, Oval (vestibular) window and Round (cochlear) window d

Question 12

What is in the Anterior portion of the middle ear wall

Answer 12

Auditory Tube and Canal for Tensor Tympani

Question 13

Which auditory ossicle is attached to the tympanic membrane?

Answer 13

Malleus

Question 14

What are the three auditory ossicles

Answer 14

Incus, Malleus and Stapes

Question 15

What shape does the stapes look like?

Answer 15

A stirrup

Question 16

What shape does the malleus look like

Answer 16

Hammer

Question 17

Two muscles in the ear

Answer 17

Tensor Tympani and Stapedius

Question 18

Attachment of Stapedius

Answer 18

Pyramidal process on posterior wall to Stapes

Question 19

Attachment of Tensor Tympani

Answer 19

Pharyngotympanic tube to the malleus

Question 20

Innervation of Tensor Tympani

Answer 20

V3

Question 21

Innervation of Stapedius

Answer 21

CN VII

Question 22

Action of Stapedius

Answer 22

Decreases vibrations of stapes

Question 23

Action of Tensor Tympani

Answer 23

Pulls malleus medially to tense tympanic membrane

Question 24

Purpose of Pharyngotympanic tube

Answer 24

Purpose is to equalize pressure between exterior and middle ear

Question 25

What three muscles are involved in opening of the pharyngotympanic tube?

Answer 25

Levator Veli Palitini, Tensor veli palitini and Salpingopharyngeus muscles

Question 26

Which two of the three muscles are attached to the pharyngotympanic tube

Answer 26

Tensor Veli Palitini and Salpingopharyngeus muscles

Question 27

What innervates the external ear

Answer 27

1. Cervical Plexus - Great Auricular 2. CN V3 - Auriculotemporal nerve 3. CN VII, X - Small auricular branches