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Neuro 1 > P1 - Tracts > Flashcards

P1 - Tracts Flashcards

1
Q

Function of Dorsal Column Medial Lemniscus (DCML)

A

sensory information for fine touch, proprioception, and vibration

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2
Q

Fasciculus Gracilis

A

carries sensory information for fine touch, proprioception, and vibration from lower limb

located more medially in SC

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3
Q

Fasciculus Cuneatus

A

carries sensory information for fine touch, proprioception, and virbation from upper limb

located more laterally in SC

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4
Q

Pathway of DCML

A
  • originates in peripheral receptors of UE/LE and travels through fasciculus gracilis/cuneatus to synapse w/ gracile/cuneate nuclei in medulla
  • decussates in medulla to contralateral side, then synapses w/ ventral posterolateral nucleus in thalamus
  • travels from thalamus to primary somatosensory cortex in postcentral gyrus
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5
Q

DCML Decussation

A

yes - in the medulla

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6
Q

Function of Anterolateral Spinothalamic Tract

A
  • anterior: sensory information for crude touch and pressure
  • lateral: sensory information for pain and temperature
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7
Q

Pathway of Anterolateral Spinothalamic Tract

A
  • originates in UE/LE receptors to dorsal root ganglion, where it synapses in dorsal horn of SC
  • decussates immediately (w/in 1-2 segments) through anterior commissure of SC to contralateral side and continues traveling up the SC to synapse w/ ventral posterolateral nucleus in thalamus
  • travels from thalamus to primary + secondary somatosensory cortices through internal capsule
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8
Q

Anterolateral Spinothalamic Decussation

A

yes - through anterior commissure at SC level (or w/in 1-2 segments) it enters

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9
Q

Function of Posterior Spinocerebellar Tract

A

carries proprioceptive information from lower limbs and trunk to cerebellum for coordination of movement and balance

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10
Q

Pathway of Posterior Spinocerebellar Tract

A
  • originates in receptors in LE and synapses w/ Clark’s nucleus in dorsal horn of SC
  • travels ipsilaterally to inferior cerebellar peduncle in cerebellum
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11
Q

Posterior Spinocerebellar Tract Decussation

A

does NOT decussate

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12
Q

Function of Anterior Spinocerebellar Tract

A

carries proprioceptive information from lower limbs to cerebellum

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13
Q

Anterior Spinocerebellar Tract Pathway

A
  • originates in receptors in LE and synapses in dorsal horn of SC
  • decussates immediately at SC level of entry to ascend contralaterally to midbrain
  • at the superior cerebellar peduncle, some fibers will cross again (back to ipsilateral), while others remain contralateral
  • all fibers synapse in cerebellum
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14
Q

Anterior Spinocerebellar Decussation

A

yes - 2 times
- all fibers decussate at SC level of entry
- in the cerebellum, some fibers will decussate again to return to the ipsilateral side

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15
Q

Function of Cuneocerebellar Tract

A

carries proprioceptive information from upper limbs and neck to cerebellum for coordination of movement

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16
Q

Cuneocerebellar Tract Pathway

A
  • originates in receptors of UE and neck and ascends to synapse w/ lateral cuneate nucleus in medulla
  • continues to travel ipsilaterally and synapse in cerebellum via inferior cerebellar peduncle
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17
Q

Cuneocerebellar Tract Decussation

A

does NOT decussate

18
Q

Function of Rostrospinocerebellar Tract

A

carries proprioceptive information from upper body to cerebellum for coordination and motor control

19
Q

Rostrospinocerebellar Tract Pathway

A
  • originates in receptors of UE and synapses in cervical SC
  • travels ipsilaterally to synapse in cerebellum via inferior + superior cerebellar peduncles
20
Q

Which tracts are pyramidal?

A

corticospinal (lateral + medial), corticobulbar

21
Q

Function of Lateral Corticospinal Tract

A

fractionated, distal limb movements (voluntary movement)

22
Q

Lateral Corticospinal Tract Pathway

A
  • originates in primary motor cortex (precentral gyrus), decussates at pyramidal decussation of medulla, then decends contralaterally through lateral funiculus to synapse w/ interneurons or motor neurons in ventral horn
  • interneurons/motor neurons synapse w/ peripheral nerves
23
Q

Lateral Corticospinal Tract Decussation

A

yes - in medulla at pyramidal decussation

24
Q

Function of Medial Corticospinal Tract

A

postural, gross movements of proximal/axial muscles

25
Q

Medial Corticospinal Tract Pathway

A
  • originates in premotor cortex and descends ipsilaterally through medial funiculus of SC to synapse w/ interneurons or motor neurons in ventral horn
  • interneurons/motor neurons synapse w/ peripheral nerves
26
Q

Medial Corticospinal Tract Decussation

A

does NOT decussate

27
Q

Function of Corticobulbar Tract

A

voluntary movement of facial muscles (ie. facial expression, speech, etc)

28
Q

Corticobulbar Tract Pathway

A
  • originates in primary motor cortex
  • decussates in brainstem at different levels for each cranial nerve before synapsing with cranial nerves for facial muscles (V, VII, IX, X, XI)
29
Q

Corticobulbar Tract Decussation

A

yes - in brainstem (most fibers do)

30
Q

Which tracts are extrapyramidal?

A

reticulospinal, vestibulospinal (medial + lateral), rubrospinal, olivospinal

31
Q

Function of Reticulospinal Tract

A

(anticipatory) postural control and gross limb movements

32
Q

Reticulospinal Tract Pathway

A
  • originates in reticular formation in medulla + pons, then descends ipsilaterally to motor neurons in anterior ventral gray matter
  • from spinal cord, it synapses w/ proximal muscles involved in balance, posture, and locomotion
33
Q

Reticulospinal Tract Decussation

A

does NOT decussate

34
Q

Function of Medial Vestibulospinal Tract

A

movement of neck + upper back muscles based on information from vestibular apparatus

35
Q

Medial Vestibulospinal Tract Pathway

A
  • originates in vestibular nuclei in medulla + pons, decussates in upper medulla, then descends contralaterally to synapse w/ motor neurons in anteromedial gray matter
  • from spinal cord, it goes to neck, back, and postural muscles
36
Q

Medial Vestibulospinal Tract Decussation

A

yes - in upper medulla

37
Q

Function of Lateral Vestibulospinal Tract

A

maintain balance and posture as body moves

38
Q

Lateral Vestibulospinal Tract Pathway

A
  • originates in vestibular nuclei in medulla + pons, then descends ipsilaterally to synapse w/ motor neurons in anteromedial gray matter
  • from spinal cord, it goes to ipsilateral, proximal extensor muscles
39
Q

Lateral Vestibulospinal Tract Decussation

A

does NOT decussate

40
Q

Function of Rubrospinal Tract

A

facilitate upper limb distal muscle activity (fine motor control)

41
Q

Rubrospinal Tract Pathway

A
  • originates in red nucleus of midbrain tegmentum, decussates immediately at ventral tegmental decussation in midbrain
  • descends contralaterally to synapse w/ motor neurons in anterolateral gray matter to go to distal muscles of UE
42
Q

Rubrospinal Tract Decussation

A

yes - in midbrain at ventral tegmental decussation

Neuro 1 (8 decks)

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