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molecular and cellular neuroscience > somatosensory system > Flashcards

somatosensory system Flashcards

1
Q

sensitivity to stimuli interacting with ones body (touch temp pain)

A

exteroception

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2
Q

ability to sense position, location and orientation

A

proprioception

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3
Q

stimuli originating from inside body

A

interoception

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4
Q

information from ___ is carried by dorsal root ganglia and spinal cord

A

trunk

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5
Q

information from ___ is carried by cranial nerves

A

face and head

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6
Q

dorsal root ganglia contain __ ___ __ that innervate skin, muscles, joints and organs

A

neuronal cell bodies

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7
Q

___ ___ of nerve fibers (DRG) involved in touch are encapsulated by special end organs

A

peripheral process

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8
Q

DRG neurons are

A

pseudounipolar

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9
Q

information carried by DRG enters in ___ spinal cord in each of the regions

A

dorsal

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10
Q

receptor type and fiber which carries proprioception

A

muscle spindle, and Ia, II (large and well myelinated); fast

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11
Q

receptor type and fiber which carries touch

A

merkel, meissner and ruffini cells (end organs), A beta (well myelinated not as big)

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12
Q

receptor type and fiber which carries pain and temperature

A

free nerve endings, A delta

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13
Q

receptor type and fiber which carries pain, temp, itch

A

free nerve endings, C fibers (smallest and unmyelinated)

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14
Q

cell that responds to mechanical stimulus

A

mechanoreceptors

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15
Q

the nerve endings of mechanoreceptors respond to stimulus by

A

stretching (as plasma membrane stretches it opens Na channels –> depolarization)

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16
Q

depolarizing potenial that accomponies stimulation of a sensory nerve (varies according to strength of stimulus)

A

receptor potential

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17
Q

part of a sensory field that can elicit neuronal responses when stimulated (each neuron has one but size and freq. can be different)

A

receptive field

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18
Q

decline of electrical response in a receptor cell over time, even thouhg stimulus id still present

A

adaptation

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19
Q

in the glaborous skin receptors (very sensitive skin) have

A

free nerve endings (no end organs)

20
Q

small receptive fields near surface of skin that tracks motion; rapidly adapting

A

meissner corpuscle

21
Q

small receptive fields near surface of skin that tracks shape and texture; slowly adapting

A

merkel cell

22
Q

large receptive fields deeper in skin that tracks skin stretch; slowly adapting

A

ruffini corpuscle

23
Q

large receptive fields deeper in skin that tracks skin vibration; rapidly adapting

A

pacinian corpuscle

24
Q

the layers of the pacinian corpuscle get depressed and after a certain point stop ____

A

responding

25
Q

superficial receptors

A

merkels and meissners

26
Q

deep receptors; distributed more evenly throughout hand

A

ruffini and pacinian

27
Q

type of hair follicle: longest, nerve fibers form touch domes and circumferential nerve endings

A

guard

28
Q

type of hair follicle: longitudinal lanceolate endings

A

awl

29
Q

type of hair follicle: circumferential and longitudinal endings

A

zigzag

30
Q

innervation arising from one DRG and its spinal nerve

A

dermatome

31
Q

2 types of muscle fibers

A

extrafusal and intrafusal

32
Q

muscle fibers that contract and do the work

A

extrafusal

33
Q

muscle fibers that detect stretch and dont contract

A

intrafusal

34
Q

each ____ muscle fiber is innervated

A

intrafusal

35
Q

____ ___ ___ signal changes in muscle lenght by muscle tension and correlation with muscle spindle

A

golgi tendon organ

36
Q

the golgi tendon organ activates when __ ___ contract

A

extrafusal fibers

37
Q

the __ neurons innervate golgi tendon and synspase on interneurons

A

Ib

38
Q

_____ fibers enter into dorsal spinal cord

A

mechanosensitive

39
Q

one branch of dorsal column synapses onto motor neuron and interneurons; other branch travels in the dorsal columns to ____

A

medulla

39
Q

the dorsal column pathway decussates and then synapses at the ____

A

medulla

40
Q

the dorsal column pathway finally hits the thalamus VPL then to

A

primary somatosensory cortex

41
Q

major cranial nerves involved in ____ and pain is the ___ nerve

A

mechanoreception; trigeminal

42
Q

the cranial nerves make synapses at ____ of the trigeminal complexes

A

nucleus

43
Q

after it synapses it goes to the ___ of the thalamus and primary somatosensory

A

VPM

44
Q

representation of body and face

A

somatopic

45
Q

sensory cortices and thalamus are organized into ____ in the mammalian brain

A

modules

46
Q
A

molecular and cellular neuroscience (8 decks)

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