Ear

Question 1

6 Structures of Auricle

Answer 1

Helix (outer curvature)
Antihelix (second curvature)
Tragus (anterior thing that sticks back)
Antitragus (lower thing that sticks up)
Concha (curly part in middle)
External auditory meatus (space b/w tragus/antitragus)

Question 2

3 Nerves that Do Sensory Innervation Around Ear

Answer 2

Auriculotemporal branch of trigeminal (V3)
Great auricular
Lesser occipital

Question 3

Blood Supply of External Ears (2)

Answer 3

Superficial temporal and posterior auricular a.s

Question 4

Structural Support of Ear Canal (2)

Answer 4

Lateral third - cartilaginous

Medial 2/3 - canal in temporal bone

Question 5

Ceruminous glands

Answer 5

Produce earwax

Question 6

Sensory Innervation of Ear Canal (2)

Answer 6

Primarily auriculotemporal branch of trigeminal (V3)

Small portion by vagus (X) right by tympanic membrane - upset stomach from inner ear infection

Question 7

2 Parts of Tympanic Membrane

Answer 7

Pars flaccida (loose, smaller part) and pars tensa (tense, main part)

Question 8

4 Projections onto Surface of Tympanic Membrane

Answer 8

Anterior and posterior malleolar folds
Manubrium of malleus
Umbo (very end of malleus)

Question 9

External Sensory Nerve Supply of Tympanic Membrane (2)

Answer 9

Auriculotemporal (V3) and Vagus (X)

Question 10

Internal Sensory Nerve Supply of Tympanic Membrane

Answer 10

Glossopharyngeal n. (IX)

Question 11

Middle Ear Ext. to Int. (4)

Answer 11

External acoustic meatus
Tympanic membrane
Tympanic cavity
Auditory tube

Question 12

Function of auditory tube

Answer 12

Bring air from nasopharynx to equalize pressure on each side of tympanic membrane

Question 13

Tensor tympani m. (2)

Answer 13

Innervated by V3 and runs to posterior side of tympanic membrane to tense it

Question 14

3 Structures on Lateral Tympanic Cavity Wall

Answer 14

Tympanic membrane - malleus - incus

Question 15

Epitympanic recess

Answer 15

Where malleus and incus reside

Question 16

Internal Carotid A. Relation to Middle Ear

Answer 16

Runs right past tympanic cavity, can hear heartbeat in very quiet room

Question 17

Chordatympani n.

Answer 17

Off of facial n. (VII) and runs b/w middle ear bones, so middle ear damage can damage that nerve

Question 18

Stapedius m.

Answer 18

Tenses stapes

Question 19

6 Contents of Medial Tympanic Cavity Wall

Answer 19

Oval window where fluid comes in
Stapes
Stapedius m.
Round window where fluid exits
Promontory - bulge from cochlea, with tympanic n. (IX) branches on it

Question 20

One Reason Why Kids get more Ear Infections

Answer 20

Auditory tube much shorter

Question 21

Auditory Tube Structural Support (2)

Answer 21

Cartilaginous in nasopharynx

Bony in middle ear

Question 22

Reason for Auditory Muscles (Tensor tympani and stapedius m.s)

Answer 22

Protect ears from loud noises by tensing and preventing too much vibration - but need to hear loud sounds first (so gunshot can still deafen)

Question 23

2 Nerves in Middle Ear Region

Answer 23

Chorda tympani branch of facial n. (VII)

Glossopharyngeal n. (IX)

Question 24

2 Structures of Inner Ear (and functions + one other point)

Answer 24

Cochlea for hearing
Vestibular appartus for balance
Filled w/ endolymph

Question 25

Vestibulocochlear n. (VIII)

Answer 25

Strictly sensory for hearing and balance

Question 26

2 Types of Deafness

Answer 26

Conductive and auditory

Question 27

Conductive Deafness

Answer 27

Where something in middle ear/bones don’t work

Question 28

Otitis Media

Answer 28

Inflammation of middle ear, puts pressure on ossicles & tympanic membrane and muffles hearing