Ear

Question 1

accumulation of blood between the perichondrium and cartilage of the auricle

Answer 1

auricular hematoma; cauliflower ear

Question 2

otitis externa

Answer 2

infection of the external acoustic meatus; excessive moisture, trauma, and occlusion of the canal can lead to it

Question 3

otitis media

Answer 3

infection of middle ear leading to inflammation and swelling of the mucous membrane of the tympanic cavity; can block pharyngotympanic tube

Question 4

what does the roof (tegmen tympani bone) separate

Answer 4

tympanic cavity from mid cranial fossa

Question 5

what does the bony floor (jugular wall) separate

Answer 5

tympanic cavity from the bulb of the internal jugular vein

Question 6

what does the medial wall (promontory from cochlea) separate

Answer 6

tympanic cavity from inner ear

Question 7

what does the posterior wall (mastoid wall) separate

Answer 7

tympanic cavity from facial canal (facial n.) and mastoidal cells

Question 8

what does the anterior wall (carotid) separate

Answer 8

tympanic cavity from carotid a.

where pharyngotympanic tube is!!

Question 9

innervation of tensor tympani M.

Answer 9

CNV3; mandibular; pulls malleus medially

Question 10

innervation of stapedius M.

Answer 10

CN7; posterior wall inserts on stapes pulling it posterior

Question 11

what gives rise to the tympanic plexus

Answer 11

tympanic nerve (from CNIX) gives rise to lesser petrosal n.

Question 12

what muscle attaches to the oval window

Answer 12

stapedius

Question 13

what is dependent on DLX5 and DLX6

Answer 13

the dorsal utricular part of the inner ear

Question 14

what are TBX1 and PAX6 responsible for?

Answer 14

ventral saccular development of inner ear

Question 15

what is the bony labyrinth filled with

Answer 15

perilymph

Question 16

what is the membranous labyrinth filled with

Answer 16

endolymph

Question 17

what prosensory organ of the ear is responsible for detecting rotation (angular acceleration)

Answer 17

cristae in the semicircular canals

Question 18

what prosensory organ of the ear is responsible for detecting linear acceleration and gravity

Answer 18

maculae in the utricle and saccule

Question 19

what prosensory organ of the ear is responsible for detecting hearing

Answer 19

organ of Corti via endolymph in the cochlea

Question 20

what makes the pharyngotympanic tube?

Answer 20

proximal part of tubotympanic recess (its pharyngeal pouch)

Question 21

what makes the tympanic cavity?

Answer 21

distal part of the tubotympanic recess

Question 22

what are the malleus and incus derived from?

Answer 22

PA1

Question 23

what is the stapes derived from?

Answer 23

mostly PA2; outer rim is mesovermally derived

Question 24

what is the origin of the external acoustic meatus?

Answer 24

1st pharyngeal groove