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Yr 2 Anatomy > Neuroanatomy Lecture 4: Spinal Cord > Flashcards

Neuroanatomy Lecture 4: Spinal Cord Flashcards

1
Q

what does the Corticospinal/ pyramidal tract carry

A

voluntary motor

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2
Q

what does the Posterior/ dorsal column carry

A

main sensory:
touch, tactile localisation, vibration sense, proprioception

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3
Q

what does the Lateral spinothalamic tract carry

A

pain and temp

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4
Q

what part of internal capsule does corticospinal tract go through

A

posterior limb

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5
Q

what type of fibres do cranial nerves leave through

A

early through corticobulbar fibres

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6
Q

where do corticospinal fibres cross

A

decussation of pyramids

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7
Q

where do motor fibres leave if going to:
neck
upper limb
intercostal muscles

A

neck = cervical level to cervical plexus
upper limb = ventral horns of C3-T1 brachial plexus
intercostal = T1-L2

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8
Q

where do LMN of corticospinal tract sit

A

ventral horn

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9
Q

where do the first order neurons become second (i.e cross over) in POSTERIOR/ DORSAL COLUMN

A

medulla

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10
Q

what is the POSTERIOR/ DORSAL COLUMN called after it cross with 2nd order neuron

A

medial lemniscus

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11
Q

journery of POSTERIOR/ DORSAL COLUMN fibres x4

A

1st order neuron travels to medulla and synapses with 2nd after crossing

now is medial lemniscus synapses in thalamus
to become third order

3rd order travels to internal capsule then post central gyrus

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12
Q

whats the blue part called

what travels down in

A

crus cerebrii

cerebrospinal - motor

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13
Q

whats travels down the red bit

A

all sensory- spinithalmic and dorsal collumn

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14
Q

journey of spinothalmic tract

A

1st order synapses as soon as it enters spine

2nd order travels up to thalamus

3rd order from thalamus to internal capsule

internal capsule to post central gyrus

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15
Q

what tract is this

how can you tell

A

corticospinal tract

starts in multiple areas of brain
crosses in medulla
leaves through ventral horn

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16
Q

what tract is this

how can you tell

A

posterior/dorsal collumn

crosses at pyramids
leaves through dorsal collumn

17
Q

what tract is this

how can you tell

A

lateral spinothalamic

crosses in spinal cord

18
Q

stretch reflex pathway x6

A
  1. tendon gets stretched
  2. muscle fibres stimulated
  3. sensory neuron activated
  4. MONOsynaptic reflex arc
  5. muscle contracts
    also:
    4b. POLYsynaptic reflex arc inhibits antagonist muscle
19
Q

flexor reflex pathway

A
  1. pain
  2. sensory neuron activated
  3. POLYsynaptic reflex arc
  4. flex and withdraw

4b. Crossed extensor response to other limb (only in legs)

20
Q

what type of neurons do reflexes use

A

LMN

21
Q

what do UMN neuron problems do to reflexes

A

exaggerate them

22
Q

what type of neurons control muscle tone

A

LMN

23
Q

how do UMN/LMN effect muscle tone

A

UMN increases tone
LMN decreases tone

24
Q

what does a L UMN lesion at internal capsule cause x3

A

*R sided paralysis
*Hyper-reflexia
*Increased tone

25
Q

what does L UMN lesion at upper cervical spinal cord cause

A

*L sided paralysis- crossed over by this point
*Hyper-reflexia
*Increased tone

26
Q

what does a L LMN lesion cause

A

*L sided paralysis
*Absent reflexes
*Flaccid

27
Q

when are symptoms contralateral

A

when lesion is above deccusation of pyramids

28
Q

when are symptoms ipsilateral

A

when lesion is below deccusation of pyramids

29
Q

what does brown-sequard syndrome effect x4

A

exact half of spinal chord- 1 ventral and dorsal horn of same side

so same side of lesion will loose motor and sensory
same side increased reflexes
with other side loss of pain and temp

30
Q

symptoms of Brown-Sequard Syndrome of left side of C3

A

Left sided paralysis
Left sided loss of touch, vibration sense

Right sided loss of temperature and pain

Reflexes on left side exaggerated

31
Q

what does damage to an UMN cause X5

A

hyperreflexia
hypertonia
spasticity
Positive Babinski sign
CLONUS

Yr 2 Anatomy (26 decks)

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