Exam 3: Cm 12 Inner Ear; Osseous Vestibule And Semi Circular Canals

Front 1

Each division of the Semi Circular Canals, Vestibule and Cochlea have both a _____ labyrinth and a ______ labyrinth

Back 1

Osseous and Membranous

Front 2

____ is the outer tube, while _____ is the inner tube

Back 2

Osseous outside; Membranous inside

Front 3

What type of fluid fills the membranous tube/labyrinth?

Back 3

Endolympth

Front 4

What type of fluid fills the bony tube/labyrinth?

Back 4

Perilymph

Front 5

Inner ear is divided into 2 cavity systems...

Back 5

1) Organs of equilibrium
2) Organ of hearing

Front 6

Inner ear contains 2 labyrinth systems...

Back 6

Osseous-exavations
Membranous-sacs and ducts

Front 7

What does the Bony labyrinth consist of?

Back 7

System of canals and cavities within the dense (petrous) portion of the temporal bone

Front 8

When does inner ear attain full size?

Back 8

By middle of fetal life

Front 9

What is the otic capsule?

Back 9

The embryonic cartilage capsule that surrounds the inner ear mechanism and develops into bony tissue.

Front 10

what components of inner ear have to do with balance?

Back 10

semi circular canals and vestibule

Front 11

what components of inner ear have to do with hearing?

Back 11

cochlea

Front 12

what makes the inner ear special?

Back 12

Contains the neural sensors and ends that initiate the neural activity necessary to hear.

Front 13

name the 3 divisions of the inner ear

Back 13

vestibule, semicircular canals, and cochlea

Front 14

Cochlea is ______ in the auditory mechanism

Back 14

Anterior

Front 15

Vestibule is located where?

Back 15

Between Cochlea and SCC

Front 16

The space that is filled with perilymph is often referred to as the ______

Back 16

perilympathic, perilymphic space

Front 17

If we examine the surface of the bony labyrinth we would see that it is covered with ________

Back 17

fibrous membrane

Front 18

What does the perilymphatic epithelium (membrane) secrete ?

Back 18

that secretes a clear serous fluid called perilympth

Front 19

What nerve extends off of the back of the cochlea?

Back 19

8th nerve; vestibulocochlear

Front 20

Oval window fits into where in the inner ear?

Back 20

Center part of the inner ear labyrinth or boney vestibule

Front 21

Some fun...What part of the ear does Dr. Laws enjoy looking at?

Back 21

semi circular canals (ha,ha)

Front 22

Name the semi circular canals

Back 22

Superior, Posterior, Lateral

Front 23

Which of the semicircular canals share a common crus

Back 23

Superior and Posterior

Front 24

How many openings are their into the vestibule from the SCC?

Back 24

5

Front 25

Describe the Osseous vestibule

Back 25

Forms central portion of bony labyrinth and is continuous with the semicircular canals and with the cochlea; oval/ovoid in shape, 5 mm anterior-posterior; 3 mm deep; lateral wall (aka tympanic wall) contains oval window; medial wall contains small perforations and the 3 recessess

Front 26

What is the vestibular crest?

Back 26

Predominance that projects toward you. Seperates pyramid of vestibular recess superiorly from the elliptical and spherical recesses below

Front 27

What does the elliptical recess eventually house?

Back 27

Utricle

Front 28

What does the spherical recess eventually house?

Back 28

Saccule

Front 29

Describe the Osseous semi circular canals

Back 29

Comprise the posterior area of the bony labyrinth; open to vestuble; each canal about 2/3 of a circle; contains a membranous duct which occupies 1/4 of the osseous duct.

Front 30

What is an ampulla

Back 30

Dilation at the point where the canal joins the vestibule. Each semi cc has one.

Front 31

Describe the lateral canal

Back 31

sits at a 30 degree angle (horizontal) toward top of head; apullary anterior end into upper vestibule; posterior end into lower vestibule

Front 32

Describe the superior canal.

Back 32

Anterior lateral end ampulated and joins upper vestibule; posterior medial end fuses with superior lib of the posterior canal to form the crus commune

Front 33

Describe the posterior canal

Back 33

Upper limb fuses with the superior canal to form the crus commune; lower ampulated limb opens into the lower vestibule

Front 34

Describe the medial wall of the vestibule

Back 34

small perforations, orifice of vestibular aqueduct which extends to the posterior surface of the temporal bone; vestibular crest with the 3 recesses

Front 35

Describe the osseous and membranous labyrinth from the outside to the inside....

Back 35

Bone, perilympth (perilymphic space), membrane, endolympth

Front 36

What is the ductus endolymphaticus

Back 36

extension of the membranous labyrinth which terminates as a cul de sac within the layers of the dura mater in the cranial cavity

Front 37

What joins to form a common canal or crus?

Back 37

The superior and posterior semicircular canals for a common canal which opens into the vestibule on the upper and medial wall

Front 38

How do the semicircular canals lie?

Back 38

3 planes, perpendicular to one another, any two form nearly a right angle