Ear Flashcards
describe the pterion
where the parietal, temporal, sphenoid and frontal bones come together
why is the pterion gods joke?
middle meningeal artery sits behind it, its the thinnest point in the skull
the bony labyrinth is filled with?
perilymph
the membranous labyrinth is filled with?
endolymph
external surface of tympanic membrane is supplied by?
CN v3 (auriculotemporal branch)
internal surface of tympanic membrane is supplied by?
CN IX
describe the lymphatic drainage of the superior half of pinna
lateral = parotid lymph nodes
cranial surface = mastoid lymph nodes
the general lymphatic drainage of the auricle
superficial cervical lymph nodes
most depressed part of tympanic membrane is?
the umbo
pars tensa is the thickest/thinnest part of tympanic membrane?
thickest, flaccida is the thinnest part
sensory nerve supply to eustachian tube
CN IX
muscle attached to stapes and its nerve supply?
stapedius, CN VII
