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Neuroscience > Neuroscience Week 3: Descending Spinal Cord Pathways > Flashcards

Neuroscience Week 3: Descending Spinal Cord Pathways Flashcards

1
Q

Lateral corticospinal tract origination

A

Motor Cortices (mostly)

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2
Q

Lateral corticospinal tract Terminate

A

Contralaterally in spinal motor neurons

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3
Q

Lateral corticospinal tract Function

A

innervate distal muscularture for fine motor movements

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4
Q

Medial aspect of lateral corticospinal tract

A

Arm fibers

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5
Q

Lateral aspect of lateral corticospinal tract

A

Leg fibers

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6
Q

Anterior corticospinal Tract Origin

A

Motor cortices (mostly)

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7
Q

Anterior corticospinal Tract Termination

A

Contralaterally in the spinal motor neurons

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8
Q

Anterior corticospinal Tract Function

A

inverate proximal muscles for gross motor movements

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9
Q

Hypothalamospinal tract Origin

A

Hypothalamus

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10
Q

Hypothalamospinal tract Termination

A

ipsilaterally

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11
Q

Hypothalamospinal tract Function

A

Hypothalamic control of autonomic function

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12
Q

Somatotopy: Anterior portion of the ventral horn

A

Extensors

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13
Q

Somatotopy: Posterior portion of the ventral horn

A

Flexors

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14
Q

Somatotopy: Medial portion of the ventral horn

A

Proximal muscles

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15
Q

Somatotopy: Lateral portion of the ventral horn

A

Distal muscles

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16
Q

Somatotopy of grey matter coincides with?

A

Somatotopy of the white matter

lateral grey matter distal- lateral corticospinal tract distal muscles

anterior grey matter proximal - anterior corticospinal tract proximal muscles

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17
Q

Rubrospinal Tract Origin

A

Midbrain

18
Q

Rubrospinal Tract Function

A

upper extremity flexors

19
Q

Reticulo-/Vestibulospinal Tract Origin

A

Pons/medullat

20
Q

Reticulo-/Vestibulospinal Tract Function

A

extensor musculature

21
Q

Cerebrum inhibiting Rubrospinal Tract and Reticulo-/vestibulospinal tracts

A

this is normal

22
Q

When Cerebral inhibition is lost on Rubrospinal Tract and Reticulo-/vestibulospinal tracts

A
  • with Rubrospinal Tract causing Arm Flexion
  • and
  • Reticulo-/vestibulospinal tracts causing leg extension
  • this posture is called decorticate posturing
23
Q

When there is a lesion at or below the midbrain and interrupts Cerebral inhibition of Reticulo-/vestibulospinal tracts but still interrupts the Rubrospinal tract

A
  • Decerebrate Posturing
  • Reticulo/vestibulospinal tracts cause neck and limb extension called decerebrate posturing
24
Q

Rubrospinal Tract Origin

A

Red nucleus in midbrain

25
Q

Rubrospinal Tract Termination

A

Contralateral

crosses in the ventral tegmental area of the brainstem and innervates the upper cervical spinal cord for upper limb flexion

26
Q

Tectospinal Tract Origin

A

Superior colliculus of the midbrain

27
Q

Tectospinal Tract Termination

A

Contralateral

decussates in the dorsal midbrain tegmentum

28
Q

Rubrospinal Tract Function

A

Innervates upper cervical spinal segments to activate neck movements and produce contralateral head turn

29
Q

Medial Reticulospinal Tract Origin

A

Medial zone of the pontine reticular formation

30
Q

Medial Reticulospinal Tract Termination

A

Terminates ipsilaterally mostly

31
Q

Medial Reticulospinal Tract function

A

activate axial and proximal limb extensors

32
Q

Lateral Reticulospinal Tract Origin

A

Medullary reticular formation

33
Q

Lateral Reticulospinal Tract Termination

A

Bilaterally

34
Q

Lateral Reticulospinal Tract Function

A
  • inhibits axial and proximal limb extensors
  • to a lesser degree it excites axial and proximal flexors
35
Q

Medial Vestibulospinal Tract Origin

A

Medial & Spinal vestibular nuclei

36
Q

Medial Vestibulospinal Tract Termination

A

Bilateral

37
Q

Medial Vestibulospinal Tract Function

A

excite neck extensor musculature

38
Q

Lateral Vestibulospinal Tract Origin

A

Medullary reticular formation

39
Q

Lateral Vestibulospinal Tract Termination

A

ipsilateral

40
Q

Lateral Vestibulospinal Tract Function

A

ipsilateral, perivertebral, and proximal limb extensor muscles

41
Q

Identify descending spinal tracts

A

Neuroscience (96 decks)

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