Ear

Question 1

Auricle Parts (not examining)

Answer 1

Tragus, Helix, Concha, Antihelix, lobule, external acoustic meatus

Question 2

External acosutic Meatus, Swimmers and Surfers ear

Answer 2

External third cartilagenoud
Rest is bony

Swimmer’s Ear: Mucosal inflammation from water exposure
Surfers ear: Boney part starts to grow in and narrow the tube

Question 3

External Ear Nervous supply

Answer 3

Auricle: Lesser occipital (helix, antihelix) (C2)
Greater Auricular (C2,C3)
Auriculotemporal branch of V3 ( Sup medial)
Vagus (tragus?) (deeper parts)

Question 4

Roof or ____ of Middle Ear

Answer 4

Tegmental Wall

Separates ME from Middle cranial fossa (petrous part of the temporal bone)

Question 5

Floor or ____ Wall of ME

Answer 5

Jugular

A branch of glossopharyngeal nerve runs through, to enter tympanic plexus
Beneath is internal jugular

Question 6

Lateral wall of ME

Answer 6

Tympanic membrane

Question 7

Medial or ___ Wall of ME

Answer 7

Labryinthine

• Promontery
• Tympanic plexus (made of Sympathetic plexus from internal carotid, CN9 and mkes lesser petrosal nerve)
• Oval and round windows
• Prominence of facial nerve
• Semilunar canal prominence

Question 8

Anterior or carotid wall

Answer 8

• Eustachian/Pharyngotympanic tube
• Tensor tympani muscle
• Chorda tympani nerve (taste to ant 2/3 of tongue!) (exit)
• Carotidotympanic nerves (to plexus)

Question 9

Posterior wall (mastoid wall)

Answer 9

Stepdius tendon
Corda Tympani nerve (from facial nerve, entry)
Aditus to mastoid antrum!! Mastoiditis, emergency!

Question 10

Middle Ear contents

blood supply?

Answer 10

Ossicles, some muscles, Corda tympani, tympanic plexus nerves (innervation thus)

external carotid

Question 11

Pg 13 module book, paper cited

Answer 11

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