Lecture 16: Anatomy and Histology of the Ear Flashcards Preview

Year 1: 05. Neuro Exam 1 > Lecture 16: Anatomy and Histology of the Ear > Flashcards

Flashcards in Lecture 16: Anatomy and Histology of the Ear Deck (59)
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1

What composes the external ear?

Auricle to Tympanic Membrane

2

What composes the middle ear?

Tympanic Membrane to Oval Window

3

What composes the inner ear?

Oval Window to Internal Acoustic Meatus

4

What type of cartilage is the external ear mostly made up of?

Elastic Cartilage

5

What supplies the external ear?

Posterior Auricular Artery (from ECA)
Superficial Temporal Artery (from ECA)

6

What provides sensory innervation to the external ear?

1. Facial Nerve
2. Cervical Plexus: Lesser Occipital and Greater Auricular Nerves
3. Auriculotemporal Nerve (V3)
4. Vagus/Glossopharyngeal Nerve

7

What innervates the superior part/roof of the external acoustic meatus?

Facial Nerve

8

What innervates the posterior part of the external acoustic meatus?

Greater Auricular Nerve (Cervical Plexus)

9

What innervates the anterior part of the external acoustic meatus?

Auriculotemporal Nerve (V3)

10

What innervates the inferior part/floor of the external acoustic meatus?

Vagus: Arnold Nerve
-plays a role in the cough reflex

11

What glands make ear wax?

Ceruminous Glands

12

What is the composition of the external acoustic meatus?

Outer ⅔: Soft CT and Cartilage (similar to external ear)
-where you can see ceruminous and sebaceous glands + hair follicles
Inner ⅓: Just skin and bone

13

Where is the cone of light?

Anterior, inferior quadrant of Tympanic Membrane

14

What makes up the roof of the middle ear?

Tegmental Wall (from Temporal Bone)
-Separates ear from brain/middle cranial fossa

15

What makes up the floor of the middle ear?

Jugular Wall
-Separates ear from bulb of Internal Jugular Vein

16

What makes up the lateral wall of the middle ear?

Membranous Wall (going to external ear)

17

What makes up the medial wall of the middle ear?
What is found at this wall?

Labyrinthine Wall (Oval and Round Windows)
-Lateral Semicircular Canal
-Facial Canal and Nerve
-Promontory of Labyrinthine Wall

18

What makes up the posterior wall of the middle ear?

Mastoid Wall
-Separates tympanic cavity from mastoid air cells and facial canal

19

What can be found at the anterior wall of the middle ear?

Pharyngotympanic Tube
Tensor Tympanic Muscle
-Separates Tympanic Cavity from Internal Carotid Artery

20

What does the pharyngotympanic tube connect?

Middle ear to nasopharynx

21

What does the pharyngotympanic tube do?

Equalize pressure

22

What two muscles expand the pharyngotympanic tube?

Levator Veli Palatini Muscle
Tensor Veli Palatini Muscle

23

What type of epithelium is found on the pharyngotympanic tube?

Pseudo-stratified Epithelium

24

What three bones make up the auditory ossicles in the middle ear?
What pharyngeal arches are they from?

Malleus (PA 1)
Incus (PA 1)
Stapes (PA 2)

25

What does the auditory ossicles do?

Transmit sound from the air to the fluid filled concha

26

What does the Tensor Tympani Muscle do?
What nerve innervates it?

Dampens loud sounds by pulling on handle of malleus
Innervated by CN V3

27

What does the Stapedius Muscle do?
What nerve innervates it?

Dampens vibrations and limits excess movement of stapes bone (at the neck)
Innervated by CN VII

28

Where is the bony labyrinth located?

Petrous Region of Temporal Bone

29

What separates bony labyrinth with membranous labyrinth?

Perilymph

30

What lymph is found in membranous labyrinth?

Endolymph