SPHS-S 201 Lecture Notes - Lecture 4: Helicotrema, Earwax, Brainstem
29 Jul 2018
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Document Summary
Anatomical position and components: located within the petreous part of the temporal bone, has two main components the bony labrininth and membranous labyrinth, bony labyrinth contains perilymph, membranous labyrinth contains endolymph. As its name suggests, it is continuous with the vestibule; contains perilymph: scala tympani: located inferiorly to the cochlear duct. It terminates at the round window; contains perilymph: scala media: the middle region; houses the hearing mechanism (organ of corti); contains endolymph, at the apex, the two chambers join and form a hook-like region called the. Helicotrema: helicotrema region through which the scala vestibule and scala tympani communicate. Hair cells: tectorial membrane indirectily linked to inner hair cells by fluid motion, displaced by fluid motion in scala media. Acoustics: sound, change in pressure, displacement of molecules in a certain medium, produces a waveform, emanates from a vibrating system, travels faster in a denser medium.
