Ear

Question 0

Otitis media

Answer 0

middle ear infxn

*Common in children

Spread of infxn =>Hearing loss; possible spread thru Tegmen tympani

Treatment- tympanostomy

Question 1

Middle Ear boundaries

Answer 1

Roof- Tegmen tympani (thin part of temporal bone)

Floor- Jugular vein found below

Anterior-Canal for Tensor tympani
Auditory tube

Posterior- Mastoid air cells, CN VII

Medial Wall- Oval window; Round window

Question 2

Tensor tympani

Answer 2

tenses the tympanic membrane to dampen sound

O-Canal in ant. wall

I-handle of malleus

N- V3

Question 3

Stapedius

Answer 3

O- Posterior wall

I-neck of stapes

N- VII

Question 4

Sensory innervation of inner ear

Answer 4

Visceral sensory coming from the tympanic plexus of IX

-formed by the tympanic nerve

Question 5

VII in the middle ear

Answer 5

Travels thru internal auditory meatus to provide branchiomotor to stapedius

• Also gives off the greater petrosal nerve and chorda tympani

Question 6

Chorda tympani

Answer 6

Crosses over the handle of the malleus in the tympanic cavity

• Taste to anterior 2/3 of tongue parasympathetic to sublingual salivary and submandibular glands
• Loss of taste if tympanic membrane pierced