auditory function and balance Flashcards
anatomy: summarise the anatomy of the ear, cochlea and labyrinth
diagram of ear
diagram of external ear canal, middle ear, cochlea and labyrinth
diagram of anatomy of labyrinth
superior projection of right bony labyrinth on base of skull: diagram and angles of canals
as stimulus is movement, important to have correct orientation; anterior canal 45 degrees forward, posterior canal 45 degrees back, lateral canal 30 degrees (in between)
2 components of outer ear
pinna (auricle) and external acoustic meatus (external auditory meatus/auditory canal)
function of outer ear
collects and conduct sound waves towards tympanic membrane
location of middle ear
air-filled chamber in bone, lying between tympanic membrane laterally and oval and round windows medially
2 components of inner ear
cochlea and organs of balance; inner ear in petrous part of temporal bone (well protected); ampulla on one end of canal, not on other end
function of inner ear
hair cells transduce mechanical energy of sound into electrical signal in cochlear nerve
diagram of auditory pathway
diagram of middle ear
anatomical features of cochlear
hollow tube in bone, curled into spiral; divided longitudinally into 3 compartments, separated by 2 membranes; cochlear hair cells attached to basillar membrane
2 membranes of cochlear which vibrate with sound waves
vestibular (Reissner’s) and basillar membranes
diagram of cochlea
anatomical features of organ of corti
hair cells surrounded by support cells; tectorial membrane; spiral ganglion embedded in modiolus; stria vascularis secretes endolymph (high in K+ and low in Na+)
diagram of organ of corti (spiral organ)
