osseous vestibule and osseous semi-circular canals

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class lecture

end organ of hearing

the neural ends/sensors that will initiate the neural activity that we hear; found in the inner ear

How many divisions does the inner ear have?

3

What are the divisions of the inner ear?

vestibule, semicircular canals, cochlea

What is the function of the vestibule?

balance

What is the function of the semicircular canals?

balance

What is the function of the cochlea?

hearing

Do the divisions of the inner ear share any common features?

yes

Where in space is the cochlea found in relation to the other parts of the inner ear?

anterior to the other two

What labyrinths are found within the three divisions of the inner ear?

osseous labyrinth and membranous labyrinth

osseous labyrinth

system of canals and cavities within the dense petrous portion of the temporal bone

membranous labyrinth

series of communicating membranous sacs and ducts WITHIN the osseous labyrinth

When do these labyrinthal structures attain full size?

by the middle of fetal life

endolymph

found inside the inner membranous tube of the membranous labyrinth

perilymph

found in the space between the inner tube (membranous) and the outer bony tube

perilymphatic space

space between the inner tube (membranous) and the outer bony tube containing perilymph

fibroserous membrane

covers the surface of the bony canal

perilymphatic epithelium membrane

attached to the fibroserous membrane

What does the perilymphatic epithelium membrane do?

secretes a clear serous fluid called perilymph

What is the sequence of physical makeup of the inner ear?

bone on the outside, next perilymphatic space filled with perilymph, then membranous space, then endolymphatic space filled with endolymph at very middle

What is the largest nerve found coming off back of the cochlea?

8th nerve, which carries info up into the higher auditory pathways

Where is the oval window found?

tympanic wall of the vestibule; this interacts with the stapes

How many semicircular canals are there?

3

What is a unique feature of the placement of the semicircular canals?

any two canals form a nearly right angle

Which canal opens to the vestibule on both ends?

the lateral canal

How many openings into the vestibule do the posterior and superior canals have?

one each

common cruz

found straight above the vestibule; comes down into the vestibule and is a shared opening into the vestibule for the posterior and superior canals

osseous vestibule

forms the central portion of the boney labyrinth

What shape is the vestibule?

oval

What is the width of the vestibule?

about 5mm from anterior to posterior

How deep is the vestibule?

3mm

Which wall of the vestibule contains the oval window?

lateral wall

What are four major features of the vestibule?

pyramid of the vestibule, vestibular crest, elliptical recess, and spherical recess

vestibular crest

separates the pyramid of the vestibule on the top from the elliptical and spherical recesses below

What physical characteristics does the vestibular crest have?

a prominence that projects out

Do the elliptical and spherical recess project out?

no, they are caved in- recesses in the bone

What important feature is found within the elliptical recess?

the utricle of the membranous labyrinth

What important feature is found within the spherical recess?

the saccule of the membranous labyrinth

Where are the osseous semicircular canals found?

the posterior area of the boney labyrinth

Where do the osseous semicircular canals open into?

the vestibule

How much of a circle is each canal?

2/3 of a circle

How much of the osseous duct does the membranous duct occupy?

about 1/4 of the osseous duct

How many ampulla does each ear contain?

3

lateral canal

sits at a 30 degree angle to the horizontal, so it's raised toward the top of your head by about 30 degrees

Which end of the lateral canal goes into the upper vestibule?

the apullary anterior end

Which end of the lateral canal goes into the lower vestibule?

posterior end

Which end of the superior canal goes into the upper vestibule?

ampulated antero-lateral end

Which end of the superior canal fuses with the superior limb of the posterior canal?

postero-medial end- portion forms the crus commune

Which end of the posterior canal fuses with the superior canal of the posterior canal?

superior limb- portion forms the crus commune

Which end of the posterior canal goes into the lower vestibule?

the lower ampulated limb

How many openings from the canals are there into the vestibule?

5

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