Neurohistology

Question 1

pseudounipolar neuron

Answer 1

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

Question 2

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

Answer 2

brainstem

Question 3

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

Answer 3

spinal cord

Question 4

what types of neurons are associated with senosry receptors

Answer 4

bipolar

pseudounipolar

Question 5

structure of bipolar neurons

Answer 5

have a cell body, peripheral process, and central process

Question 6

where are bipolar neurons usually associated with

Answer 6

special senses

Question 7

what are the sensory receptors for the visual system

Answer 7

rods and cones

Question 8

what are teh receptors in the vestibular and cochlear ganglion

Answer 8

hair cells

Question 9

what do sensory receptors vary by

Answer 9

location in body
morphology
velocity of conduction
modality which they carry

Question 10

what modalities are carried by cranial nerves

Answer 10

olfaction
vision
gustation
audition

Question 11

___ are inovled with pressure senstation

Answer 11

pacinian corpuscles

Question 12

receptive field

Answer 12

the area or territory where the receptor resides

Question 13

exteroceptors

Answer 13

close to surface of the body

Question 14

types of exteroreceptors

Answer 14

teloreceptors, contact receptors

Question 15

examples of teloreceptors

Answer 15

rods, cons, auditory hair cells

Question 16

function of chemoreceptors in hypothalamus

Answer 16

contain chemoreceptors that sample contents of blood

sensitive to osmolarity of blood

Question 17

function of chemoreceptor in barotid body

Answer 17

for oxygen and CO2 conc in blood

Question 18

baroreceptor in carotid sinus function

Answer 18

stretch receptor, help with blood pressure regulation

Question 19

polymodal nociceptor

Answer 19

stimulus may be chemical, thermal, or mechanical

Question 20

pruriceptor

Answer 20

respond to inscent bite

Question 21

what stimulated pruriceptors

Answer 21

histamine

Question 22

examples of non-encapsulated mechanorecpetors

Answer 22

free nerve endings
peritrichial nerve endings
tactile receptors

Question 23

examples of encapsulated mechanoreceptors

Answer 23

meissner, pacinian, ruffini, muscle spindle, GTO

Question 24

function of peritrichial nerve ending

Answer 24

detect bending of the hair

Question 25

merkel disc

Answer 25

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

Question 26

functino of merkel cell

Answer 26

help enhanse sensory perception

Question 27

where are meissner corpuscles located

Answer 27

in dermal papillae with overlying epiderm

Question 28

function of meissner corpuscle

Answer 28

help with 2 point discrimination | assist in reading braille

Question 29

where are muscle spindles found

Answer 29

only skeletal muscle

Question 30

nuclear bag

Answer 30

has central non-contractile region containing many nuclei | has contractile polar ends

Question 31

nuclear chain fiber

Answer 31

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

Question 32

function of nuclear chain fibers

Answer 32

detecting changes in muscle length

Question 33

static nuclear bag fibers

Answer 33

detect changes in muscle length

Question 34

dynamic nuclear bag fibers

Answer 34

detect rate of change of muscle length

Question 35

what are contractile portion innervated by

Answer 35

gamma motor neurons

Question 36

what are non-contractile portions innervated by

Answer 36

annulospiral endings

Question 37

what do annulospinral endings respond to

Answer 37

onset of muscle stretch

Question 38

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

Answer 38

flow spray endings

Question 39

function of flow spray endings

Answer 39

detect ongoing muscle stretch

Question 40

where is GTO located

Answer 40

where skeletal muscle fibers insert into a tendor

Question 41

what type of innervation does GTO have

Answer 41

only sensory ia heavily myelinated fibers

Question 42

function of GTO

Answer 42

detect tension applying to a tendon

Question 43

why is there minimal or no regneation of CNS

Answer 43

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

Question 44

general function of sensory receptor

Answer 44

protective

Question 45

do brain and spinal cord have sensory receptors

Answer 45

NO