Basilar Membrane

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What is the tympanic surface of the Basilar Membrane covered with?

a layer of mesothelium through which courses vascular tissue

spiral lamina

a very narrow shelf of bone at the apical end of the cochlear duct, becoming gradually wider toward the basal end

Where is the basilar membrane the lest stiff?

at the apex

Where is the basilar membrane the widest?

at the apex

Where is the basilar membrane the narrowest?

at the base

Where is the basilar membrane the stiffest?

at the base

What takes place between the two plates of bones of the spiral lamina?

canals for the transmission of the peripheral fibers of the auditory nerve

internal spiral sulcus

concavity on outer edge of spiral limbus

What is the base layer of the basilar membrane made of?

connective tissue

Where is the basilar membrane located?

extends from the tympanic lip of the osseous spiral lamina to the basilar crest of the spiral ligament

basilar membrane

forms a fibrous layer that serves as a footing for the spiral organ or organ of corti

vas spirale

found in center of the basilar membrane, runs the length of the basilar membrane

vascular covering

found on the underneath side of the basilar membrane facing the scala tympani

zona arcuata

fragile, thin portion closest to the spiral lamina

What is the stiffness ratio of the basilar membrane?

from one end to the other: 100 to 1

What is unique about the vestibular lip?

it has a serrated appearance- "auditory teeth"

vas spirale

largest of the vessels found within the tympanic surface of the basilar membrane

What is found on top of the base layer of the basilar membrane?

layer of transverse fibers that are perpendicular to the axis of the cochlear duct

tympanic lip

lower extremity of the spiral limbus

Is the basilar membrane stretched?

no, there is no tension

What is another name for the zona arcuata?

pars tecta

habenulae perforata

perforations along the tympanic lip of the spiral lamina giving passage to the cochlear nerves

arcuate zone

portion of the basilar membrane closest to the spiral laminae; innermost fragile portion

How does the size of the basilar membrane relate to the osseous spiral lamina?

the width of the osseous spiral lamina is greater at the base, and is narrower at the apex- the reverse of the basilar membrane measurements

spiral limbus

thickening of periosteum continuous with the upper layer of bone of the spiral lamina

pectinate portion

thicker more rigid portion of the basilar membrane located toward the outside wall/ Spiral ligament

vestibular lip

upper extremity of the spiral limbus

What two physical characteristics are found on the spiral limbus?

vestibular lip and tympanic lip

How many layers does the pectinate portion of the basilar membrane have?

2

How many bones does the spiral lamina consist of?

2 plates of bones

About how many of the transverse fibers are there?

24,000


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