ear pt 2 Flashcards
(19 cards)
what is the shape and length of the external acoustic meatus?
1in and S shaped
what portion of the external acoustic meatus is in the temporal bone?
medial 2/3
what do the modified sweat glands of the external acoustic meatus produce?
cerumen
where does the external acoustic meatus terminate?
tympanic membrane
what is the blood supply to the external ear?
External carotid artery- posterior auricular branch
Superficial temporal artery- anterior auricular branch
Occipital artery- auricular branch
what is the SENSORY supply to external ear? (3)
Auriculotemporal nerve opthalmic division trigeminal
Auricular branch Vagus
Great auricular nerve (C2-3)
what is the MOTOR supply to external ear?
temporal and posterior auricular branches of facial nerve
what is the SYMPATHETIC supply of external ear?
superior cervical ganglion
where is middle ear located?
btw tympanic membrane and inner ear
what are the 3 bones of the middle ear/tympanic cavity?
incus, malleus, stapes
what are the 2 muscles located in the tympanic cavity of middle ear?
stapedius and tensor tympani
which is the largest bone of the tympanic cavity and comes in contact with tympanic membrane?
malleus
which bone transmits vibration from malleus to stapes?
incus
which bone is the 3rd in sequence and sits against the oval window?
stapes
what is the blood supply to the middle ear?
Internal maxillary artery- anterior tympanic branch
Internal carotid artery- tympanic branch
what is the sensory supply to the middle ear?
tympanic nerve of glossopharyngeal
what nerve supplies the stapedius muscle of the middle ear?
nerve to stapedius of facial nerve
what nerve supplies the tensor tympani muscle of the middle ear?
medial pterygoid nerve, mandibular division, trigeminal
what is the sympathetic supply of the middle ear?
caroticotympanic nerves carry vasomotor and secretomotor fibers from SUPERIOR CERVICAL GANGLION by way of INTERNAL CAROTID PLEXUS
