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Neuro Exam I > Neurohistology > Flashcards

Neurohistology Flashcards

1
Q

pseudounipolar neuron

A

sensory neuron located in dorsal root ganglia or the sensory ganglia of CN

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2
Q

if the cell body is located in a sensory ganglian where does sensory info enter

A

brainstem

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3
Q

if the cell body is located in a dorsal root ganglia where do central poscess enter

A

spinal cord

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4
Q

what types of neurons are associated with senosry receptors

A

bipolar

pseudounipolar

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5
Q

structure of bipolar neurons

A

have a cell body, peripheral process, and central process

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6
Q

where are bipolar neurons usually associated with

A

special senses

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7
Q

what are the sensory receptors for the visual system

A

rods and cones

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8
Q

what are teh receptors in the vestibular and cochlear ganglion

A

hair cells

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9
Q

what do sensory receptors vary by

A

location in body
morphology
velocity of conduction
modality which they carry

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10
Q

what modalities are carried by cranial nerves

A

olfaction
vision
gustation
audition

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11
Q

___ are inovled with pressure senstation

A

pacinian corpuscles

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12
Q

receptive field

A

the area or territory where the receptor resides

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13
Q

exteroceptors

A

close to surface of the body

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14
Q

types of exteroreceptors

A

teloreceptors, contact receptors

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15
Q

examples of teloreceptors

A

rods, cons, auditory hair cells

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16
Q

function of chemoreceptors in hypothalamus

A

contain chemoreceptors that sample contents of blood

sensitive to osmolarity of blood

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17
Q

function of chemoreceptor in barotid body

A

for oxygen and CO2 conc in blood

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18
Q

baroreceptor in carotid sinus function

A

stretch receptor, help with blood pressure regulation

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19
Q

polymodal nociceptor

A

stimulus may be chemical, thermal, or mechanical

20
Q

pruriceptor

A

respond to inscent bite

21
Q

what stimulated pruriceptors

A

histamine

22
Q

examples of non-encapsulated mechanorecpetors

A

free nerve endings
peritrichial nerve endings
tactile receptors

23
Q

examples of encapsulated mechanoreceptors

A

meissner, pacinian, ruffini, muscle spindle, GTO

24
Q

function of peritrichial nerve ending

A

detect bending of the hair

25
Q

merkel disc

A

dilated dendritic terminal of a pseudounipolar neuron that contacts the merkel cell

26
Q

functino of merkel cell

A

help enhanse sensory perception

27
Q

where are meissner corpuscles located

A

in dermal papillae with overlying epiderm

28
Q

function of meissner corpuscle

A

help with 2 point discrimination

assist in reading braille

29
Q

where are muscle spindles found

A

only skeletal muscle

30
Q

nuclear bag

A

has central non-contractile region containing many nuclei

has contractile polar ends

31
Q

nuclear chain fiber

A

more slender
non-contraile central region
has polar, contractile regions

32
Q

function of nuclear chain fibers

A

detecting changes in muscle length

33
Q

static nuclear bag fibers

A

detect changes in muscle length

34
Q

dynamic nuclear bag fibers

A

detect rate of change of muscle length

35
Q

what are contractile portion innervated by

A

gamma motor neurons

36
Q

what are non-contractile portions innervated by

A

annulospiral endings

37
Q

what do annulospinral endings respond to

A

onset of muscle stretch

38
Q

what inenrvates the portion of fibers that are at the border between contractile and noncontractile regions

A

flow spray endings

39
Q

function of flow spray endings

A

detect ongoing muscle stretch

40
Q

where is GTO located

A

where skeletal muscle fibers insert into a tendor

41
Q

what type of innervation does GTO have

A

only sensory ia heavily myelinated fibers

42
Q

function of GTO

A

detect tension applying to a tendon

43
Q

why is there minimal or no regneation of CNS

A

no schwann cells to help guide axon sprouds
oligodendrocytes release inhibiting factor
astrocyte do not produce enoug growth factor
scar tissue gets in way

44
Q

general function of sensory receptor

A

protective

45
Q

do brain and spinal cord have sensory receptors

A

NO

Neuro Exam I (10 decks)

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