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33 Cards in this Set

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Where is the organ of corti located?
Scala Media
What is an organ?
It is a collection of specialized cells to accomplish a specific function
What is the stria vascularis?
Specialized cells that run up the margin of the spiral ligament toward the superior Reissner's Membrane. They are not supporting cells; they have a different function. It secretes endolymph
Space between the vestibular lip and the tympanic lip
Perforate Habenulla
How does sound energy travel through the scala media.
Sound wave energy from stapes pushes down on the Reissner's membrane which then effects the basilar membrane and is released into the scala vestibule. Low frequency sounds will come through the scala media at the apex. High frequency sounds will come through the scala media to the scala tympani closer to the base of the cochlea...
Rods of Chordi/Pillars of Chordi
-2 sets of cells: inner and outer rod of chordi
-2 rods separated by imaginary perpendicular line
5 spaces that are filled with fluid
Inner Sulcus; Inner Tunnel of Corti; Space of Nuel; Outer Tunnel; Outer Spiral Sulcus
Rows of hair cells
Sensory cells
Border Cells of Held
Epithelium; large, flat, irregular, multisided, polygonal cells; cover vestibular lip; supporting cells for the inner hair cells; line the internal spiral sulcus
Inner Phalangeal Cell
Unique looking cell; 2 parts: body rests directly on the spiral lamina near the perforate habenulla and extends to lower limit of the inner hair cell.Phlangeal process of the inner phalangel cell begins near the base of the hair cell extends to the apex of hair cell and has a flattened head, a lamella, near the top of the hair cell.
What contributes to the formation of the reticular membrane?
Phalangeal process as it expands at upper limit to form a flattened lamella. In this way the inner hair cells are strongly supported at their bases by the bodies of the phalangeal cells and at their apexes by the phalangeal processes.
Phalanx
Greek, a line or array of soldiers
Rods of Corti/Pillar Cells(describe key characteristics)
Supporting cells, widely spaced at bases, converge to meet at the top, enclose a triangular tunnel of corti. Contain the cell nuclei. Distance between teh bases of the inner and outer rods increases from the basal end to the apex of the cochlea, while the angles between the rods and the basilar membrane diminishes.
Inner Rods of Corti
Base rests at the point of junction of the tympanic lip of the osseous spiral lamina and the basilar membrane. Number about 6000.
Outer Rods of Corti
Base rests on the outer limit of the arcuate zone of the basilar membrane. Number about 4000
Inner tunnel of Corti
Floor formed by the bases of the rods and the basilar membrane. Walls of tunnel are not solid, slits between rods allow endolymph to circulate and nerve fibers to pass through. However at heads and bases the rods are continous (no holes)
What do the interlocking/overlapping headplates of the rods do?
Bridge a gap between the inner hair cells and the first row of outer hair cells.
Thin headplates of the outer pillar cells
Phalangeal processess that unite with the phalangeal processes of other supporting cells to for reticular membrane
Delicate netlike structure which lies over the spiral organ
Reticular membrane
Cells of Dieters/Outer Phlangeal Cells-Location
Bases of first row are in direct contact with the bases of the outer pillars but main bodies become widely seperated above to enclose space of Nuel. Bases rest on the pectinate zone of basilar membrane.
Cells of Dieter-Shape
Similar to inner cells in that they have a base and coming out of base is a phalangeal process as it rises up to the superior margin of the hair cells. Main body is cylindrical, but at when comes into contact with the base of the hair cell it forms a cup and also gives off an ascending phalangeal process.
Why is the reticular membrane/lamina not an independent structiure?
It is composed of the inner phalanges, headplates of the inner rods, phalangeal processes of the outer rods and of the Dieters cells. Its function is the lend support to the apexes of the hair cells.
Supporting Cells of Henson-Location
Immediately adjeacent to the outer row of Dieters cells. Narrow bases of innermost row rest on the basilar membrane in direct contact with the bases of the outer row of Dieters cells. Toward apex are seperated slightly from outer row of hair cells giving rise to outer tunnel
What are the supporting cells of Hensen made up of?
5-6 rows of tall columnar cells
Where is the space of Nuel located?
Inverted, triangular endolymphatic space located inbetween main bodies of Deiters cells.
net like
reticular
lamina
flat plate
Describe the composition of the Reticular Lamina/Membrane
Fabric put together loosely; formed by inner phalangeal cells, headplates of inner rods, phalangeal process of outer rods, upper heads of Dieter cells.
What is the purpose of the Reticular Membrane
Lend support to the tops of the outer hair cells (outer hair cells project through this lamina)
What do the Cells of Claudius (and Boettcher) form?
They lie outside of the Hensen's cells. Form base of the outer tunnel or external spiral sulcus.
Describe composition of Cells of Claudius
Additional rows of columnar and cuboidal cells, in decreasing height, Continuous with the highly vascular layer of epithelium lining the spiral ligament.
Describe the Tectorial Membrane
Delicate, semitransparent, Floating Gelatinous mass of the cochlea. Connected at the vestibular lip and runs out over the top of the inner hair cells, inner phalangeal cells, rods of corti, space of Neul and Terminates at the start of the Border Cells of Hensen.
Describe how the headplates of the pillars of corti fit together
Inner plate is flat and fits up over headplate of outer pillar