unit 8: special senses, external ear Flashcards
ectododermal thickening on lateral “head” is called the ___, which invaginates to give rise to the auditory pit, then the auditory ___
placode
vesicle
auditory vesicle gives rise to most of the membranous __ __
inner ear
two things that are derived from the FIRST PHARYNGEAL POUCH
auditory tube
tympanic cavity
the ___ is derived from the dorsal end of the ventral mandibular cartilage
malleus
the __ develops from the dorsal end of the first pharyngeal ARCH
incus
the ___ develops from the dorsal end of the SECOND pharyngeal arch
stapes
the tympanic membrane develops from the __ __
interstitial mesoderm
the external acoustic canal AND auricle develop from the __ __ __
first pharyngeal groove
the external ear includes what two parts
auricle
external acoustic meatus
___ is a horn like structure that funnels sound waves into the external acoustic meatus, and is composed of __
auricle
cartilage
helix antihelix scaphoid fossa triangular fossa concha tragus antitragus intertragic notch lobule --all landmarks of the
auricle
extrinsic muscle that inserts on the front of the helix and is the SMALLEST
anterior auricular muscle
extrinsic musc that inserts on the superior side of the auricle, is the LARGEST
superior auricular musc
extrinsic musc that inserts on the lower, posterior aspect of the concha
posterior auricular muscle
helicis major & minor tragicus antitragicus transverse musc of the auricle oblique musc of the auricle -are all \_\_\_ muscles of the ear
intrinsic
S shaped ~1 in structure that’s medial 2/3 portion is within the temporal bone, and terminates at the tympanic membrane
external acoustic meatus (EAM)
EAM’s entire length is covered by skin, and modified sweat glands that produce ___
cerumen
____ examination of the EAM is made poss by gently pulling out, down and fwd on teh lobule
otoscopic
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
posterior
anterior
auricular
three nerves that lend sensory supply to the external ear
auriculotemporal (off ophthalmic division, trigem)
auricular (off vagus)
great auricular nerve
the ___ and __ ___ branches of the facial nerve lend MOTOR supply while sympathetic supply to the external ear is from the __ __ ganglion
temporal
posterior auricular
superior cervical
