Middle Ear (week 3) Flashcards Preview

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Flashcards in Middle Ear (week 3) Deck (27):
0

What innervates the external ear

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

1

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

Posterior Auricular and Superficial Temporal

2

What branch of the Maxillary artery supplies blood to external ear

Deep Auricular

3

All branches of arteries that supplies blood to external ear

Deep Auricular, Superficial Temporal and Posterior Auricular

4

two parts that make up the tympanic membrane

Flaccid part and Tense part

5

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

Superior

6

What innervates the external portion of the tympanic membrane

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

7

What innervates the internal portion of the tympanic membrane

CN IX - Tympanic Plexus

8

What does the Tegmen Tympani do?

Separates middle ear from middle cranial fossa

9

What does the floor of the middle ear do?

Separates middle ear from internal jugular vein

10

What is in the lateral portion of the middle ear

Chorda Tympani, Tympanic membrane and Epitympanic recess

11

What is contained in the medial wall of the middle ear

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

12

What is in the Anterior portion of the middle ear wall

Auditory Tube and Canal for Tensor Tympani

13

Which auditory ossicle is attached to the tympanic membrane?

Malleus

14

What are the three auditory ossicles

Incus, Malleus and Stapes

15

What shape does the stapes look like?

A stirrup

16

What shape does the malleus look like

Hammer

17

Two muscles in the ear

Tensor Tympani and Stapedius

18

Attachment of Stapedius

Pyramidal process on posterior wall to Stapes

19

Attachment of Tensor Tympani

Pharyngotympanic tube to the malleus

20

Innervation of Tensor Tympani

V3

21

Innervation of Stapedius

CN VII

22

Action of Stapedius

Decreases vibrations of stapes

23

Action of Tensor Tympani

Pulls malleus medially to tense tympanic membrane

24

Purpose of Pharyngotympanic tube

Purpose is to equalize pressure between exterior and middle ear

25

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

Levator Veli Palitini, Tensor veli palitini and Salpingopharyngeus muscles

26

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

Tensor Veli Palitini and Salpingopharyngeus muscles