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18 Cards in this Set
- Front
- Back
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Lateral corticospinal tract
- Pathway - |
Cerebral Cortex
Cerebral white matter Internal Capsule Midbrain cerebral peduncles Ventral pons - basis pontis Medulla (CMJ) 85% dec. dorsolateral funiculus Synapse @ ventral horn 7, 8, 9 alpha motor neuron |
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Anterior Corticospinal tract
- Pathway - |
Cerebral cortex
Cerebral white matter - corona radiata Internal Capsule Midbrain cerebral peduncles Ventral pons - basis pontis Medulla (CMJ) 85% dec. Ventral column ipsilateral white matter synapse bilaterally @ 7, 8 alpha motor neuron |
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Rubrospinal tract
- Pathway - |
Red nucleus
rostral midbraoin - tegmentum dec. @ rostral pons - pontomesencephalic junction lateral medulla lateral column of spinal cord synapse with interneurons @ lateral intermediate zone 7 internurons synapse with alpha motor neuron @ 9 |
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Vestibulospinal tract
- Pathway - |
medial vestibular nucleus (MVN) in
rostral medulla cervical SC - medial longitudial fasciculus (MLF) descends bilaterally contralateral fibers dec. in rostra medulla just after MVN terminates @ cervical 7, 8 project to alpha/gamma motor neurons |
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Tectospinal tract
- Pathway - |
superior colliculus in the
tectum of midbrain dec. immediately contralateral medial ventral columns synapse in 6, 7, (8) |
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Reticulospinal tract
- Pathway - |
reticular formation of
brain stem descend both ventral and lateral white columns pontine fibers uncrossed, medial medullary fibers both crossed and uncrossed (mostly ipsilateral, anterior to rubrospinal tract) terminate 7, 8 bilaterally |
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Lateral Corticospinal Tract
- Summary - |
Function: Motor to limbs
Side: Contra Start: Cortex - Motor Crosses @ Medulla (Py-D) Descends: Dorsolateral Funniculus Ends: Ventral, 7,8,9 |
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Rubrospinal Tract
- Summary - |
Function: Motor to limbs
Side: Contra Start: Midbrain - Red Nucleus Crosses @ Midbrain / Pons VTD Descends: Lateral column WM Ends: Lateral 9 |
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Anterior Corticospinal Tract
- Summary - |
Function - Axial & Girdle muscles
Side: Ipsi Start: Cortex - Motor Crosses: (does not) Descends: Ventral column WM Ends: Ventral 7 |
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Vestibulospinal Tract
- Summary - |
Function: Head position & Balance
Side: Both Start: Pons - Vestibular Nucleus Crosses @ Medulla (Rostral) Descends: Medial longitudinal fasciculus Ends: Cervical 7, 8 |
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Tectospinal Tract
- Summary - |
Function: Posture & Gait
Side: Contra Start: Midbrain - Superior Colliculus Crosses @ Midbrain - Caudal DTD Descends: Medial ventral WM Ends: Cervical 6, 7, 8 |
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Reticulospinal Tract
- Summary - |
Function: Head & eye coordination
Side: Ipsi 2 portions Start: Pons RF & Medullar RF Descends: Ventral lateral WM Ends: Dorsal or ventral 78 |
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Dorsal Column Medial Lemniscus
- Pathway - |
enter SC @ medial dorsal root
1st synapse w/ 2nd in nuclus gracilis & cuneatus decussates as internal arcuate fibers in medulla travel up as medial lemniscus (name change) up to ventral posterolateral nucleus in thalamus syunapse with 3rd 3rd through posterior limb of internal capsule reaches primary somatosensory cortex |
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Spinothalamic Tract
- Pathway - |
enters SC @ dorsal root
synapse immediately in gray matter (dorsal horn 1, 2) 2nd cross over SC anterior commisure ascend in anterolateral WM up laterally in medulla betw. Olivse & inf. Cerebellar ped enter pons lateral to medial lemiscus (next to red nucleus) "VPL" of thalamus 2nd synapse with 3rd, project to somatosensory cortex |
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DCML
- Summary - |
Function: fine touch, vibration, proprioception
Side: Contra Start: medial dorsal root nucleus gracilis nuecleus cuneatus Crosses @ Medulla (internal actuate fibers) Ascends: Posterior column of spinal cord - medial lemniscus |
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Spinothalamic Tract
- Summary - |
Function: Crude touch
Pain Temperature Side: Contra Start: Dorsal root Crosses @ anterior commisure in spinal cord Ascends: Anterolateral WM, lateral medulla |
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Descending Motor Tracts:
Which are lateral? Which are medial? |
Lateral:
Lateral corticospinal Rubruospinal Medial: Anterior corticospinal Vestibulospinal Reticulospinal Tectospinal |
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Ascending Tracts:
Which are they? |
DCML (dorsal column medial lemniscus)
Spinothalamic |
