Audiology Exam 3 UPDATED Exam
Questions and CORRECT Answers
Name the three cochlear scalae - CORRECT ANSWER - -Scala Vestibuli
-Scala Tympani
-Scala Media
Scala Media - CORRECT ANSWER - -Reissner's Membrane
-Stria Vascularis
-Organ Corti
-Basilar Membrane
-Endolymph
Perilymph - CORRECT ANSWER - -space between the osseous and membranous
labyrinths is called the PERILYMPHATIC SPACE because it is filled with a fluid called
PERILYMPH.
-Perilymph is high in sodium (Na+) and low in potassium (K+)
-thought that it is from cochlear blood flow.
Endolymph - CORRECT ANSWER - The membranous labyrinth is filled with another
fluid: ENDOLYMPH
Endolymph is high in potassium (K+), and low in sodium (Na+). This fluid is produced by the
stria vascularis
There is no communication between the two labyrinths; much like an inner tube inside a tire.
, modiolus - CORRECT ANSWER - bony core around which the cochlea coils
The Cochlea - CORRECT ANSWER - The auditory portion of the inner ear
-resembles a snail shell
-It is cone shaped and measures 5mm from its base to
apex and 9mm across its breadth of the base.
It is a coiled structure with 2 3/4 turns or coils around the modiolus
BONY COCHLEA - CORRECT ANSWER - The bony canal is about 35mm in length and
narrows from base to apex.
There are two major openings in the bony canal:the oval window and the round window.
The inner ear contains two labyrinths in the OTIC CAPSULE - CORRECT ANSWER - 1)
osseous: a series of cavities within the petrous portion of the temporal bone: BONY
LABYRINTH
2) membranous: a series of soft tissue canals, sacs, and ducts within the bony labyrinth; follows
the bony labyrinth in shape, but is smaller: MEMBRANOUS LABYRINTH
membranous cochlea - CORRECT ANSWER - The membranous cochlea follows the
osseous cochlea,but instead of narrowing at the apex, it widens. It is also stiffer at the
base, and flaccid at the apex. It
is also called the sensory
epithelium of the cochlea.
basilar membrane - CORRECT ANSWER - membrane supporting the organ of Corti and
hair cells in the cochlea
How many inner hair cells are there? - CORRECT ANSWER - One row of Inner Hair
Cells (3,500) - flask-shaped
Questions and CORRECT Answers
Name the three cochlear scalae - CORRECT ANSWER - -Scala Vestibuli
-Scala Tympani
-Scala Media
Scala Media - CORRECT ANSWER - -Reissner's Membrane
-Stria Vascularis
-Organ Corti
-Basilar Membrane
-Endolymph
Perilymph - CORRECT ANSWER - -space between the osseous and membranous
labyrinths is called the PERILYMPHATIC SPACE because it is filled with a fluid called
PERILYMPH.
-Perilymph is high in sodium (Na+) and low in potassium (K+)
-thought that it is from cochlear blood flow.
Endolymph - CORRECT ANSWER - The membranous labyrinth is filled with another
fluid: ENDOLYMPH
Endolymph is high in potassium (K+), and low in sodium (Na+). This fluid is produced by the
stria vascularis
There is no communication between the two labyrinths; much like an inner tube inside a tire.
, modiolus - CORRECT ANSWER - bony core around which the cochlea coils
The Cochlea - CORRECT ANSWER - The auditory portion of the inner ear
-resembles a snail shell
-It is cone shaped and measures 5mm from its base to
apex and 9mm across its breadth of the base.
It is a coiled structure with 2 3/4 turns or coils around the modiolus
BONY COCHLEA - CORRECT ANSWER - The bony canal is about 35mm in length and
narrows from base to apex.
There are two major openings in the bony canal:the oval window and the round window.
The inner ear contains two labyrinths in the OTIC CAPSULE - CORRECT ANSWER - 1)
osseous: a series of cavities within the petrous portion of the temporal bone: BONY
LABYRINTH
2) membranous: a series of soft tissue canals, sacs, and ducts within the bony labyrinth; follows
the bony labyrinth in shape, but is smaller: MEMBRANOUS LABYRINTH
membranous cochlea - CORRECT ANSWER - The membranous cochlea follows the
osseous cochlea,but instead of narrowing at the apex, it widens. It is also stiffer at the
base, and flaccid at the apex. It
is also called the sensory
epithelium of the cochlea.
basilar membrane - CORRECT ANSWER - membrane supporting the organ of Corti and
hair cells in the cochlea
How many inner hair cells are there? - CORRECT ANSWER - One row of Inner Hair
Cells (3,500) - flask-shaped
