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Anat and Phys W6.1

Inner Ear Fluid

QuestionAnswer
What has a big impact on the tuning of the BM? The high positive potential and high concentration of the endolymphatic spaces.
What are the borders of the endolymph filled space? Lateral: Stria vascularis Posterior: Recticular lamina/tectorial membrane Anterior: Reisnner's membrane The endolymphatic space is bounded on all sides by tight junctions, known to inhibit the flow of ions.
What are the four purposes of the cochlear fluids? 1) Provide nutrients to and remove waste from hair cells 2) Provide proper chemical environment for the transfer of energy 3) Provide medium to convert mechanical energy to electrical energy 4) Provide for control of pressure distribution in the system
Sodium and potassium content in endolymph and perilymph. Endolymph: high potassium and low sodium Perilymph: high sodium and low potassium (similar to extracellular fluid and CSF)
What is the belief about the endocochlear potential? The endocochlear potential is the battery that drives the transduction process and possibly the mechanically amplifying portion of the traveling wave.
Where may perilymph come from? May arise from CSF via the cochlear aqueduct, or is an ultra-filtrate of blood plasma produced by the capillaries in the walls of the perilymph-filled space, or possibly both.
What is the Shriner's phenomenon? Radioactive material inserted into perilymph in one ear. After one year, trace amounts of radioactive material found in the contralateral ear and CSF.
What fluid is endolymph similar to? Endolymph is similar to intracellular fluids, which makes endolymph unique because it is an extracellular fluid.
Amounts of endolymph and perilymph in inner ear. Endolymph - 3 cubic mm Perilymph - 78 cubic mm
Created by: duda713
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