The middle chamber, or scala media , lies between the two outer chambers and holds the organ of Corti, where the hair cells are located. The organ of Corti sits on top of the basilar membrane and is covered by a gelatinous matrix called the tectorial membrane.
Where is the tectorial membrane located quizlet?
What is the tectorial membrane? A membrane located ABOVE the basilar membrane ; serves as a shelf against which the cilia of the auditory hair cells move.
Where is the Tectorial membrane found?
The tectorial membrane (TM) of the inner ear is a ribbon-like strip of extracellular matrix that spirals along the entire length of the cochlea.
Is tectorial membrane present in cochlea?
| Tectorial membrane (cochlea) | FMA 75805 | Anatomical terminology |
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Is the tectorial membrane part of the organ of Corti?
The organ of Corti rests on the basilar membrane and contains two types of hair cells: inner hair cells and outer hair cells. ... The fibrous tectorial membrane rests on top of the stereocilia or the outer hair cells.
What is the function of the Tectorial membrane?
the Tectorial membrane provides for a second line of defense, preventing the odontoid process from compressing the spinal cord and by doing so, secondarily limits movement of the craniocervical juncture.
Does the basilar membrane move?
When a sound wave is transmitted to the fluid of the inner ear, the basilar membrane is set in motion . Basilar membrane motion is best described as a traveling wave of deformation, which begins at the cochlear base and moves apically toward a frequency-dependent place of maximal amplitude (Fig. 4).
What causes the tectorial membrane to move?
A tectorial (roof) membrane is held in place by a hinge-like mechanism on the side of the Organ of Corti and floats above the hair cells. As the basilar and tectorial membranes move up and down with the traveling wave, the hinge mechanism causes the tectorial membrane to move laterally over the hair cells.
What stimulates hair cells?
During rotation one exhibits reflex nystagmus (back-and-forth movement) of the eyes. Slow displacement of the eye... This deflection stimulates the hair cells by bending their stereocilia in the opposite direction.
What is the tectorial membrane a continuation of?
The tectorial membrane is the thin superior continuation of the posterior longitudinal ligament from the body of the axis . It joins the axis body to the clivus on the anterior half of the foramen magnum, and ascends as high as the spheno-occipital synchondrosis and laterally extends to the hypoglossal canal.
Do hair cells have axons?
The inner hair cells are the actual sensory receptors, and 95% of the fibers of the auditory nerve that project to the brain arise from this subpopulation. ... The terminations on the outer hair cells are almost all from efferent axons that arise from cells in the brain.
What does Tectorial mean?
: forming a covering : resembling a roof.
What is the Otolithic membrane?
The otolithic membrane is a fibrous structure located in the vestibular system of the inner ear . It plays a critical role in the brain’s interpretation of equilibrium. The membrane serves to determine if the body or the head is tilted, in addition to thelinear acceleration of the body.
Where does the organ of Corti lie?
The Organ of Corti is an organ of the inner ear located within the cochlea which contributes to audition. The Organ of Corti includes three rows of outer hair cells and one row of inner hair cells. Vibrations caused by sound waves bend the stereocilia on these hair cells via an electromechanical force.
What stimulates the organ of Corti?
The motion of the stapes against the oval window sets up waves in the fluids of the cochlea , causing the basilar membrane to vibrate. This stimulates the sensory cells of the organ of Corti, atop the basilar membrane, to send nerve impulses to the brain.
Why is it called organ of Corti?
The organ of Corti is named after Italian anatomist Alfonso Corti , who first described it in 1851. Viewed in cross section, the most striking feature of the organ of Corti is the arch, or tunnel, of Corti, formed by two rows of pillar cells, or rods. The pillar cells furnish the major support of this structure.
