ear Flashcards
exam 2
2 main functions of the ear
- equilibration as in balance; the vestibular system
- hearing; the cochlear system
the external ear is refereed as the
auricle –> pinna
that gnarly external ear injury
auricular hematoma–> cauliflower area
sensory innervation of the external ear
mostly from the auriculotemporal br. of V3
some contributions from CN VII and X
Ramsay-Hunt Syndrome
shingles inside the ear canal
Arnold’s reflex
cough reflex can be stimulated by touching side of the face which is initiated by CN X
Auricular muscles are innervated by
br. of the CN VII (temporal and posterior auricular)
blood supply to the ear
sup. temporal a. and posterior auricular a.
superficial temporal v. drains into the _______
posterior auricular v. drains into the _______
sup. temporal drains into retromandibular v.
post. auricular drains into the external jugular
Lymphatic Drainage of the ear:
- lateral top half to
- medial top half to
- bottom to
- lateral top half to superficial parotid nodes
- medial top half to mastoid nodes
- bottom to superficial cervical nodes
why is a cue tip dangerous?
perforation of the tympanic membrane
tympanic membrane separates?
what is the function?
external and middle ear
capture changes in air pressure (sound waves) and transfer to the bones in the middle ear
sensory fibers from cranial nerve XI get to the inner surface of the tympanic membrane via the ______
Bonus: which hole does it go though?
tympanic nerve (jacobsen)
- tympanic cannaniculus
arcuate eminence overlies the
semicircular canals
tegmen tympani forms the roof over the
middle ear
name the 3 bones of the middle ear
- malleus
- incus
- stapes
head of the malleus articulates with the incus and the other end is the umbus
incus articulates with the stapes
stapes has an _____ shape
ovale
why is tensor tympani important?
muscle that insert to the handle of the malleus and dampens loud sounds
innervated by V3
Why is stapedius m. important?
muscle that inserts into the stapes, screeching noise activates facial nerve and pull a face
hyperacussis
high pitch due to paralysis of stapedius