Term
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Definition
Auricle - Single Iregular plate of cartilage. Sound funnel. front vs bechind.
External Auditory Meatus - contains ceruminous glands. protects tympanous membrane and keeps moist. |
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Term
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Definition
Typanic Cavity - Air filled Space
3 bones: malleus, incus, stapes
tensor tympani and stapedius muscles: tympanic attenuation reflex.
typanic membrane: thin skin, radial fibers, circular fibers, mocous membrane. |
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Term
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Definition
Membranous Labryinth: Ducts. Endolymphatic sac - absorbs endolymph
endolymph - similar to intraceulluar fluid
Bony Labyrinth lined with periosteium. Canals. Contain perilymph. Extracellular fluid, may come from CSF |
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Term
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Definition
| maculae in utricle and saccule. cristae in ampulla |
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Term
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Definition
Modiolus - Central Canal containing vessel
Spiral Lamina - Spirals around - bony and membranous
basilar membrane extends from membranous spiral lamina across cochlear canal. Seperates media from tympani
Spiral ligament - thickend periosteum where basilar membrane joins outer wall.
spiral limbus - thickened upper border of membranous spiral lamina.
vestibular membrane- seperates scalavestibuli from scala media |
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Term
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Definition
| Located on outer wall of scala media. Prodcues endolypmh |
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Term
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Definition
Inner and Outer Pillar cells, microtubles
inner and outer phalangeal cells - Support hair cells. Inner 1 Outer cell |
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Term
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Definition
| composed of keratin-like protein and glycoproteins(otogelin, tectorin) |
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Term
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Definition
The basilar membrane increases in length from base to apex of cochlea. sound perceived gradually decreases in pitch or frequency.
Fluid wave motion passes across the vestibular membrane(high frequencies) and through the helicotrema(low frequences) to se the membrane in motion. |
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Term
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Definition
located in utricle and saccule.
Hairs are embed in otolithic membrane.
Calcium carbonate crystals(otoliths) are present on the surface and slide.
responsible for gravity and linear aceleration |
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Term
| Cristae amupllares(vestibular) |
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Definition
located in apullae of semicircular ducts
cuppula rests on surface of hair cells.
Cupula is gelatinous and does not contain crystals
specific gravity of cupula is same and endolymp
cupula swing like a door(flap valve)
Measures angular acceleration and rotational velocity |
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