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| What serves as the separation between the middle and inner ear? |
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Definition
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Term
| Components of the Bony Labyrinth (Inner Ear) |
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Definition
Auditory System: Cochlea
Vestibular System: Three Semi-Circular Canals
Vestibule |
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Definition
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Term
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Definition
| The skeletal element enclosing the inner ear mechanism. |
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Term
| The two labyrinths of the inner ear... |
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Definition
Osseous: a series of cavities within the petrous portion of the temporal bone.
There is no communication between the two labyrinths; much like an inner tube inside a tire.
Membranous: a series of soft tissue, canals, sacs, and ducts within the bony labyrinth; follows the bon labyrinth in shape, but is smaller. |
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Term
| The space between the osseous and membranous labyrinths is called the |
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Definition
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Term
| The perilymphatic space is filled with a fluid called... |
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Definition
| Perilymph which is high in sodium (Na+) and low in sodium (K+); a chemical composition similar to that found outside all cells of the body called interstitial fluid. Probably a blood product from capillaries. |
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Term
| The membranous labyrinth is filled with a fluid called... |
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Definition
| Endolymph which is is high in potassium (K+), and low in sodium (Na+) |
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Term
| Endolymph is a product of what? |
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Definition
| by the stria vascularis, a structure found inside the cochlea |
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Term
| The auditory portion of the inner ear is called... |
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Definition
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Term
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Definition
5mm from base to apex 9m across.
35mm in length and narrows from base to apex
A coiled structure with 2 and 3/4 turns that coil around a bon central canal called the modiolus |
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Term
| The central pillar of the cochlea is called the |
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Definition
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Term
| What are he two major openings in the cochlea? |
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Definition
| The oval and round windows |
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Term
| What are the three chambers of scala? |
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Definition
Scala Vestibuli
Scala Tympani
Scala Media |
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Definition
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Term
| Instead of narrowing at the apex the membranous cochlea... |
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Definition
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Term
| The membranous cochlea is ______ at the base and _____ at the apex. |
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Definition
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Term
| The Scala Vestibule and Scala Tympani are filled with _______ while the Scala Media is filled with _______ |
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Definition
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Term
| 10 Structures of the Cochlea |
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Definition
1) Basilar Membrane
2) Organ of Corti
3) Outer Hair Cells
4) Inner Hair Cells
5) Reissner's Membrane
6) Tectorial Membrane
7) Stria Vascularis
8) Spiral Ligament
9) Spiral Ganglion
10) Osseous Spiral Lamina |
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Term
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Definition
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Term
| Describe the hair cells in the organ of corti |
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Definition
One row of inner hair cells (3500) - flask shaped
Three rows of Outer Hair Cells (12,500) - tubular shape
All hairs run longitudinally along the basilar membrane |
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Term
| Describe stereocilia within the organ of corti |
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Definition
fine hairlike structures that sit on the tops of each row of inner and outer hair cells with graduated heights
The are stiff structures due to actin
60 stereocilia/IHC; shallow crescent
20/100 stereocilia/OHC; W shaped
Sit within the reticular lamina |
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Term
| Describe the tectorial membrane. |
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Definition
-A gelatinous mass overlying the OHC
-90% water
-Essentially transparent
-Projects from the spiral limbus |
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Term
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Definition
- a spiral passage in the organ of Corti
- surrounded by pillar cells
-Inner and Outer pillar cells sit on the basilar membrane
- Spaces of Nuel between the OHC's
- Supporting cells (Hensens, Claudius)
- OHC's and IHC's bathed in perilymph
- Stereocilia bathed in endolymph |
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Term
| The vestibular system is composed of |
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Definition
| three semicircular canals, the space btw the canals and the cochlea known as the vestibule and the organs within it, the utricle and the saccule |
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Term
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Definition
| Measures 5mm front to back and 3mm side to side. The osseous portion has numerous landmarks including recesses for various structures, and holes for nerve fibers to pass to the retrocochlear structures |
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Term
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Definition
a soft tissue structure housed in the vestibule. The semicircular canals open into the utricle. It is located in the posterior-superior aspect of the vestibule. It is surrounded b perilymph and is filled with endolymph.
The sensory cells of the utricle sit on a
flat plate called the macula. The cells
are covered with a gelatinous substance
containing calcium carbonate crystals or
otoliths. There are some supporting cells
as well. |
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Term
| The sensory cells of the utricle sit on a flat plate called the... |
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Definition
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Term
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Definition
| a slightly smaller structure than the utricle that lies in the anterior portion of the vestibule. It's sensory cells are similar to those found in the utricle. It is also surrounded by perilymph and filled with endolymph |
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Term
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Definition
| A short tube that is part of the membranous labyrinth and connects the vestibular organs to the cochlea. |
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Term
| The Vestibular organs are connected to the cochlea by means of the |
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Definition
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Term
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Definition
| an extension of the membranous labyrinth which leads to the endolymphatic sac. |
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Term
| The perilymph of the bony labyrinth connects to the cerebral spinal fluid through a narrow canal called the... |
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Definition
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