Ear Flashcards
Auricle
(pinna)
supported by elastic cartilage
directs air vibrations into ear
External Auditory Canal
passageway to tympanic membrane
Ceruminous glands
secretes ear wax to slow bacteria growth
Tympanic membrane
(ear drum)
Thin transparent connective tissue, vibrates in synch with sound waves that strike it
connected to malleus
Ossicles
malleus, incus, stapes
vibrate fluid in cochlea
Oval window
Stapes vibrates against this window at base of scala vestibuli
Round window
at the base of scala tympani, dissipate pressure in cochlea, connected to auditory tube
Auditory tube
(Eustachian tube)
connects to nasopharynx to equalize pressure between external and middle ear
Tympanic reflex
tensor tympani and stapedius muscles of inner ear contract to reduce effect of loud sound waves
Membranous labyrinth
filled w/endolymph
location of mechanoreceptors of balance and hearing
Bony labyrinth
bone that surrounds and protects inner ear
perilymph is found between hear and membranous labyrinth
Semicircular canals
3 canals are 3 dimensionally arranged 90 degrees to each other
-detects rotational acceleration or deceleration
Vestibule
detects change in head position or linear acceleration and deceleration
Cochlea
spirals 2.5 times around contains mechanoreceptors that detect auditory info 3 chambers -scala vestibuli: contains perilymph -scala media: contains endolymph -scala typani: contains perilymph
Vestibular membrane
separates scala vestibuli from cochlear duct