Anatomy of the Inner Ear and Cochlea Flashcards
inner ear versus the labyrinths
same thing
houses sensory ends organs of auditory and vestibular systems
inner ear
where are the labyrinths located
petrous portion of the temporal bone
anatomy of the inner ear is dominated by large fluid filled spaces which are essential for ________
signal transduction
what 2 primary components can the labyrinths be split into
1) bony labyrinth
2) membranous labyrinth
vestibule
cochlea
semicircular canals
- post., sup., lat. (horizontal)
bony labyrinth
maculae
utricle
saccule
cochlear duct
semicircular ducts
- post.,sup.,lat. (horizontal)
endolymphatic duct/sac
membranous labyrinth
what does bony labyrinth contain
perilymph
what does a membranous labyrinth contain
endolymph
typical extracellular fluid that is high in Na+ and continuous with CSF in subarachnoid space
perilymph
very atypical extracellular fluid that is high in K+ and has varying compositions throughout membranous labyrinth (result of K+ pumps) and communicates w/ venous structures of dura mater
endolymph
______ results from different compositions of perilymph and endolymph
endocochlear potential
endocochlear potential primary consists of ____ ions
K+
endolymphatic potential is approx. what at cochlea and varies through endolymphatic space
+85 mV
endocochlear potential provides the basis for _________ in sensory hair cells
signal transduction