Chn Lec 11

Front 1

These two kinds of glands lie in the external auditory meatus?

Back 1

Sebaceous glands and ceruminous glands

Front 2

Sebaceous glands and ceruminous glands along with desquamated epithelial cells make up this. Along with hair it serves a protective function.

Back 2

Cerumen (earwax)

Front 3

This structure serves the function of converting SOUND waves to VIBRATIONS?

Back 3

Tympanic Membrane

Front 4

This layer of the tympanic membrane is the outer most covering?

Back 4

Skin

Front 5

Connective tissue layer of the tympanic membrane is lined with these fibers?

Back 5

Collagen (Pars flaccida is absent in collagen fibers)

Front 6

This layer of the tympanic membrane is continous with the lining of the middle ear cavity?

Back 6

Mucosa Layer

Front 7

How many semicircular canals of the bony labyrinth are there?

Back 7

3 (superior, posterior, horizontal)

Front 8

Are all the components of the membranous labyrinth continous with each other?

Back 8

Yes

Front 9

The widest turn of this structure of the bony labyrinth produces the promontory on the medial wall of the tympanic membrane?

Back 9

Cochlea

Front 10

This sense changes in the speed of angular movement in the head, and is located within each ampulla of the semicircular ducts?

Back 10

Crista Ampullaris

Front 11

This patch of epithelium, located within the Utricle and the Saccule, senses gravity and linear movement?

Back 11

The Macula

Front 12

This feature is connected to the cochlear duct (Utricle, Saccule)?

Back 12

Saccule

Front 13

The cochlear duct contains this, which functions as the sound receptor?

Back 13

Organ of Corti

Front 14

Where is endolymph reabsorbed?

Back 14

Endolymphatic sac

Front 15

What connects the utricle and sacculae to the endolymphatic sac?

Back 15

Endolymphatic duct

Front 16

What kind of cells line the semicircular ducts?

Back 16

Simple squamous epithelium

Front 17

The crista ampullaris is covered by an epithelium consisting of what kinds of cells?

Back 17

Hair cells and supporting cells

Front 18

What kinds of hair cells are there in the crista ampullaris?

Back 18

Type 1 and type 2

Front 19

How many cilium do the hair cells possess?

Back 19

A single cilium, Kinocilium

Front 20

This hair cell type are columnar and are innervated by many small synaptic endings?

Back 20

Type 2 hair cells

Front 21

This hair cell type are flask shaped and are enclosed in a chalice-like nerve terminal

Back 21

Type 1

Front 22

This gelatinous structure rides on top of the hair cells all the way up to the roof of the ampulla?

Back 22

Cupula

Front 23

Bending hairs TOWARDS the cilium does what to the membrane (Depolarize/Hyperpolarize)?

Back 23

Depolarize

Front 24

Rotation of the head will cause hairs to be bent in the same or opposite direction as the head?

Back 24

Opposite

Front 25

What secretes the matrix of the cupula?

Back 25

Suporting cells

Front 26

Instead of cupula, what do the maculae have that the crista ampullaris doesn't?

Back 26

Otolithic membranes

Front 27

What are otolithic membranes?

Back 27

gelatinous layers with crystals of calcium carbonate known as otoconia

Front 28

Are otoconia more or less dense than endolymph?

Back 28

More dense

Front 29

Which maculae sense vertical accelaration (utricle, sacculae, both, neither)?

Back 29

Saccule

Front 30

Which maculae senses horizontal acceleration (Utricle, saccule, both, neither)

Back 30

Utricle

Front 31

What nerve recieves sensory information from the utricle, saccule, and semicircular canals?

Back 31

Vestibular nerve

Front 32

The bony core of the cochlea is called what?

Back 32

Modiolus

Front 33

How many turns do the cochlear duct make?

Back 33

2 and 3/4

Front 34

What does the modiolus house?

Back 34

The spiral ganglion of the cochlear nerve

Front 35

This is the spiraling ridge that projects outward from the Modiolus like the thread of a screw

Back 35

Spiral Lamina

Front 36

What partially divides the cochlear cavity into an upper and lower part?

Back 36

Spiral Lamina

Front 37

These two spaces within the bony cochlea contain perilymph?

Back 37

Scala vestibuli and scala tympani

Front 38

This membrane separates the endolymph of the cochlear duct with the perilymph of the scala vestibuli?

Back 38

Vestibular membrane

Front 39

The endolymph has a high concentration of these ions (Na+, Ca2+, K+, CL-)?

Back 39

Potassium K+

Front 40

What separates the cochlear duct from the scala tympani?

Back 40

Basilar membrane

Front 41

The opening at the apex of the cochlea allows the scala tympani to be continous with the scala vestibuli, what is it called?

Back 41

Helicotrema

Front 42

This spans the distance from the osseous spiral lamina to the outer wall of the cochlea (basilar lamina, vestibular lamina, both, neither)

Back 42

Both

Front 43

The stapes fits into the oval window which is the beginning of the (scala tympani, scala vestibuli, both, neither)?

Back 43

Scala vestibuli

Front 44

[Word association] Round Window

Back 44

Scala tympani

Front 45

This feature of the middle ear cavity allows vibrations to be dissipated by bulging into the cavity?

Back 45

Round window

Front 46

This membrane underlies the organ of corti and is sensitive to vibrations of specific pitch?

Back 46

Basilar membrane

Front 47

The basilar membrane at the apex of the cochlea is sensitive to (low/high) tones?

Back 47

Low

Front 48

This is the lining of the outer cochlear duct?

Back 48

Stria Vascularis

Front 49

What feature of the stria vascularis, aside from it being stratified cuboidal epithelium, allows it to secrete endolymph?

Back 49

Intimate contact with capillaries

Front 50

What are the two types of hair cells located within the organ of corti?

Back 50

Inner and Outer

Front 51

These hair cells receive 90-95% of the afferent fibers from the cochlear nerve?

Back 51

Inner Hair cells

Front 52

TRUE/FALSE The hairs of the inner hair cells are thought to be imbedded in the overlying gelatinous membrane, the tectorial membrane

Back 52

FALSE()

Front 53

These hair cells of the organ of corti receive innervation ONLY at their bases (inner, outer, both, neither)

Back 53

Outer

Front 54

These hair cells have hairs embedded in the tectorial membrane (inner, outer, both, neither)

Back 54

Outer

Front 55

Phalangeal cells support these hair cell types nearly completely (inner, outer, both, neither)

Back 55

Inner

Front 56

What do the phalangeal cells send to the apex of the outer hair cells?

Back 56

A phalangeal process to form an apical supportive plate (cuticular plate)

Front 57

This provides a barrier between the endolymph and the intercellular spaces of the organ of corti?

Back 57

Apical plates (formed by phalangeal cells)

Front 58

These cells are modified phalangeal cells and border the tunnel of corti?

Back 58

Pillar cells

Front 59

Nuclei of pillar cells are located at their (apex, base)?

Back 59

Base

Front 60

This membrane contacts the hairs of the organ of corti causing them to bend upon sound vibrations?

Back 60

Tectorial membrane

Front 61

Potassium channels of the hair cells open when the hair cells are bent in what direction?

Back 61

Toward the tallest stereocilia

Front 62

Cells in this structure secrete the tectorial membrane. It is located in the inner angle of the cochlear duct closest to the Modiolus?

Back 62

Spiral Limbus

Front 63

The entire epithelial lining is derived from this structure? Is it endo or ectoderm?

Back 63

Otic Placode, Ectoderm