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NEUROANATOMY > (3) Spinocerebellar pathways > Flashcards

(3) Spinocerebellar pathways Flashcards

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1
Q

summary: posterior/dorsal column medial lemniscus pathway carries what type of sensory information (4)

A

proprioception
fine touch
pressure
vibration

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2
Q

summary: anterolateral/spinothalamic pathway carries what type of sensory information (5)

A 
crude touch
pressure
pain 
temperature
itch
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3
Q

what are the basis of these different sensory pathways?

dorsal column and spinothalamic

A

different types of sensory receptors in skin, joints and muscle

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4
Q

cutaneous receptors do what

A

mediate sensory information in (sensory) spinal cord pathways

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5
Q

types of cutaneous receptors (4 sensations)

A

vibration= Pacinian corpuscle

touch= Meissner corpuscle (fine touch), Merkel endings (fine touch), endings around hairs, free nerve endings

pressure= ruffini endings

pain/temp/itch= free nerve endings

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6
Q

2 touch receptors from hairy skin

A

1) receptors endings wrap around hairs

2) Merkel cell (in basal layer of epidermis)

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7
Q

when skin is deformed there is a change in which receptor

A

change in merkel cell receptor onto nerve cells, and transmit to spinal cord

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8
Q

where is merkel cell found, responsible for?

A
  • hair and glabrous skin

- responsible for ability to perform fine tactile discriminations with fingertips (2 pt discrimination)

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9
Q

where are meissner corpuscle found

A

they are encapsulated endings in dermal papillae of hairless skin

  • layer of Schwann cells within the capsule
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10
Q

where are Pacinian corpuscles found

A

subcutaneously over entire body and connective tissue sites

  • rapidly adapting
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11
Q

where are ruffini endings found

A

in dermis and subcutaneously, and other connective tissue sites

  • slow adapting
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12
Q

what sensory endings are found in glabrous skin?

A

fine touch: (M) meissner corpuscle, (Me) Merkel cell

vibration: (PC) Pacinian corpuscle
pressure: (R) ruffini ending

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13
Q

what is 2 point discrimination

A

minimum distance by which 2 stimuli can be separated and perceived as 2 stimuli

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14
Q

proprioceptors

A

another way sensory information is mediated in spinal cord pathways

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15
Q

proprioception

A

perception of the position of parts of the body

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16
Q

proprioceptors are derived from

A

vibration, touch and pressure receptors in skin and joints, and muscle spindles and Golgi Tendon organs at myotendinous junctions and joints

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17
Q

muscles are supplied with 2 important types of encapsulated receptors

A
  • muscle spindle (unique to muscle)

- Golgi tendon organ (similar to ruffini ending- pressure)

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18
Q

what is the function of muscle spindles in skeletal muscle

A

relay sensory information of proprioceptors and DETECT MUSCLE LENGTH

  • provide info about position of body in space
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19
Q

muscle spindles are…

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A

long, thin, stretch receptors scattered throughout striated muscle in body

20
Q

muscle spindles consist of…

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A

intrafusal muscle fibers (inside the spindle)
- small muscle fiber with capsule surrounding middle 1/3 of fibers

  • ends of intrafusal muscle fibers are attached to extrafusal fibers
    (when muscle is stretched, intrafusal fibers also stretched)
21
Q

golgi tendon organ tracks…

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A

TENSION developed by tendon

22
Q

how does a golgi tendon organ function

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A
  • large diameter sensory fibers enter capsule and branch into fine processes that are inserted among collagent bundles
  • tension on capsule squeezes fine processes
  • resulting distortion stimulates them
23
Q

3 unconscious proprioception/sensory pathways carried by spinal cord to cerebellum via ….

Study These Flashcards
A

posterior/dorsal spinocerebellar tract

anterior/ventral spinocerebllar tract

cuneocerebellar tract

24
Q

what is the function of the cerebellum

Study These Flashcards
A

integration center for motor control

25
9 parts to posterior/dorsal spinocerebellar tract | ascending, sensory, unconscious
1) proprioceptors (muscle spindles, Golgi tendon) in lower leg 2) primary sensory neuron in DRG 3) white matter of spinal cord 4) ascend in fasciculus gracilis (spinal cord) 5) synapse with dendrites of Clarke's nucleus/nucleus dorsalis (T1-L2/L3) 6) ascend ipsilaterally in posterior spinocerebellar tract (PSCT) 7) caudal pons (lower) 8) inferior cerebellar peduncle 9) cerebellum
26
origin of posterior/dorsal spinocerebellar tract
clarke's nucleus aka nucleus dorsalis
27
body part --> posterior/dorsal spinocerebellar tract
trunk, lower extremity | remember fasciculus/nucleus gracilis
28
major inputs posterior/dorsal spinocerebellar tract
mechanoreceptors in muscles, joints and skin
29
midline crossing posterior/dorsal spinocerebellar tract
NONE
30
peduncle used to enter cerebellum posterior/dorsal spinocerebellar tract
inferior cerebellar peduncle
31
10 parts of anterior/ventral spinocerebellar tract | ascending, sensory, unconscious
1) proprioceptors (golgi tendon organs, cutaneous receptors) in lower body 2) primary sensory neuron in DRG 3) axons travel to grey matter of spinal cord 4) synapse with dendrites of spinal border cells (T12- L5) 5) axons of spinal border cells CROSS via anterior white commissure 6) ascend in anterior spinocerebellar tract (ASCT) 7) rostral pons 8) superior cerebellar peduncle 9) cerebellum (synapse) 10) CROSS beck in cerebellum
32
origin anterior/ventral spinocerebellar tract
spinal border cells
33
body part--> anterior/ventral spinocerebellar tract
trunk, lower extremity
34
major inputs anterior/ventral spinocerebellar tract
mechanoreceptors, movement related interneurons
35
midline crossing anterior/ventral spinocerebellar tract
- spinal cord | - cerebellum
36
peduncle used to enter cerebellum in anterior/ventral spinocerebellar tract
superior cerebellar peduncle
37
8 parts to cuneocerebellar tract | ascending, sensory, unconscious
1) proprioceptors (muscle spindles, golgi tendon organ) in upper body 2) primary sensory neuron in DRG 3) ascend in fasciculus cuneatus 4) synpase with dendrites of lateral cuneate nucleus (in lower medulla) 5) ascend in cuneocerebellar tract (CCT( 6) caudal pons (lower) 7) inferior cerebellar peduncle 8) cerebellum
38
origin cuneocerebellar tract
lateral cuneate nucleus (medulla)
39
body part --> cuneocerebellar tract
trunk, upper extremity
40
major inputs cuneocerebellar tract
mechanoreceptors in muscles, joints, skin
41
midline crossing cuneocerebellar tract
NONE
42
peduncle used to enter cerebellum in cuneocerebellar tract
inferior cerebellar peduncle
43
cerebellar peduncles are important for??
circuitry
44
3 cerebellar peduncles
SCP (superior)= predominant OUTPUT pathway - anterior spinocerebellar tract MCP (middle)= connect pons to cerebellum ICP (inferior)= lower part of pons, predominant peduncle for info flowing INTO cerebellum
45
lesions to spinocerebellar tracts present as...
ipsilateral loss of muscle coordination - unlikely damaged in isolation, lesions usually accompanied by injury to descending motor tracts - cause muscle weakness/paralysis, usually masks loss of muscle coordination
46
if theres damage to spinocerebellar tracts, likely have damage to which descending pathway?
lateral corticospinal tract
47
spinocerebellar tract damage component of hemicord lesions
- vibration/pain loss RIGHT side lower body= damage to dorsal columns, loss unconscious proprioceptive info to cerebellum - pain/temp loss LEFT side lower body= loss of spinothalamic/anterolateral pathway - motor loss RIGHT side lower body= loss of corticospinal tract, or motor neurons in anterior horn

NEUROANATOMY (7 decks)

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