unit 8: special senses, external ear

Question 1

ectododermal thickening on lateral “head” is called the ___, which invaginates to give rise to the auditory pit, then the auditory ___

Answer 1

placode

vesicle

Question 2

auditory vesicle gives rise to most of the membranous __ __

Answer 2

inner ear

Question 3

two things that are derived from the FIRST PHARYNGEAL POUCH

Answer 3

auditory tube

tympanic cavity

Question 4

the ___ is derived from the dorsal end of the ventral mandibular cartilage

Answer 4

malleus

Question 5

the __ develops from the dorsal end of the first pharyngeal ARCH

Answer 5

incus

Question 6

the ___ develops from the dorsal end of the SECOND pharyngeal arch

Answer 6

stapes

Question 7

the tympanic membrane develops from the __ __

Answer 7

interstitial mesoderm

Question 8

the external acoustic canal AND auricle develop from the __ __ __

Answer 8

first pharyngeal groove

Question 9

the external ear includes what two parts

Answer 9

auricle

external acoustic meatus

Question 10

___ is a horn like structure that funnels sound waves into the external acoustic meatus, and is composed of __

Answer 10

auricle

cartilage

Question 11

helix
antihelix
scaphoid fossa
triangular fossa
concha 
tragus
antitragus
intertragic notch
lobule
--all landmarks of the

Answer 11

auricle

Question 12

extrinsic muscle that inserts on the front of the helix and is the SMALLEST

Answer 12

anterior auricular muscle

Question 13

extrinsic musc that inserts on the superior side of the auricle, is the LARGEST

Answer 13

superior auricular musc

Question 14

extrinsic musc that inserts on the lower, posterior aspect of the concha

Answer 14

posterior auricular muscle

Question 15

helicis major & minor
tragicus
antitragicus
transverse musc of the auricle
oblique musc of the auricle
-are all \_\_\_ muscles of the ear

Answer 15

intrinsic

Question 16

S shaped ~1 in structure that’s medial 2/3 portion is within the temporal bone, and terminates at the tympanic membrane

Answer 16

external acoustic meatus (EAM)

Question 17

EAM’s entire length is covered by skin, and modified sweat glands that produce ___

Answer 17

cerumen

Question 18

____ examination of the EAM is made poss by gently pulling out, down and fwd on teh lobule

Answer 18

otoscopic

Question 19

blood is supplied to the external ear via the
____ auricular branch of the ext carotid a., the ___ auricular branch of the superficial temp a., and the ____ branch off the occipital artery

Answer 19

posterior
anterior
auricular

Question 20

three nerves that lend sensory supply to the external ear

Answer 20

auriculotemporal (off ophthalmic division, trigem)
auricular (off vagus)
great auricular nerve

Question 21

the ___ and __ ___ branches of the facial nerve lend MOTOR supply while sympathetic supply to the external ear is from the __ __ ganglion

Answer 21

temporal
posterior auricular
superior cervical