Term
sensory/motor fr 1 side of the body connect w what side of cerebellum?
what about forebrain (thalamus & cortex) |
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Definition
ipsilateral in cerebellum
contralateral in thalamus & cortex |
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Term
| which spinal chord segments are represented in order from the midline in the gracile & cuneate tracts? |
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Definition
gracile - sacral, lumbar, lower thoracic
cuneate - upper thoracic, cervical |
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Term
Spinothalamic (anterolateral) System
what sense?
name 3 neurons, 2 tracts
where do fibers cross? |
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Definition
Fast/Sharp pain & Crude touch
DRG -> (Lissauer’s tract) -> various
lamina in dorsal horn-> (Spinothalamic
tract) -> VPL -> Somatosensory Cortex
S1
Fibers cross at entering the spinal chord through the anterior white commisure
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Term
Lemniscal (Dorsal Column) System
what sense?
name 3 neurons & 2 tracts
where do fibers cross? |
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Definition
fine touch, pressure, vibration, proprioception
gracilis - lower limb (T7 & below)
cuneatus - upper limb (T6 & above)
DRG -> (Fasciculus Gracilis or Cuneatus) ->
Nucleus Gracilis or Cuneatus -> (Medial
Lemniscus) -> VPL -> Somatosensory Cortex S1
fibers cross at caudal medulla as internal arcuate fibers
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Term
Trigeminal Pathway - 1
what sense?
3 neurons & 2 tracts?
where do fibers cross?
at what levels are the DRG's? |
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Definition
Fine touch & pressure fr face
Trigeminal Ganglion -> (Trigeminal Tract) -> Chief
Sensory Nucleus of V in mid pons -> (Trigemino-Thalamic Tract) -> VPM -> Somatosensory Cortex S1
fibers cross upon entering midpons
DRG's are at trigeminal ganglion & midpons
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Term
Trigeminal Pathway - 2
what sense?
3 neurons & 2 tracts?
where do fibers cross?
at what levels are the DRG's?
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Definition
Pain & Temp fr face
V Ganglion -> (Descending Trigeminal Tract) ->
Spinal Nucleus of V -> (TrigeminoThalamic
Tract) -> VPM -> Somatosensory Cortex S1
fibers cross @ caudal medulla
DRG's @ trigeminal ganglia & midpons
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Term
lateral corticospinal tract
upper / lower motor neurons |
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Definition
Upper neuron in Motor Cortex -> via (Internal Capsule) -> thru Cerebral Peduncle, Pons & Pyramids, Cross in Decussation of Pyramids.
Lower Neuron in Ventral horn (output to skeletal muscles) |
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Term
Anterior corticospinal tract
Upper / Lower motorneuron & tracts
where is output?
cross over? |
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Definition
Upper Neuron: Cortex -> travel via Internal Capsule thru cerebral peduncle & pons to cervical spinal chord levels.
Lower Neuron: Ventral horn
Bilateral output to axial & girdle muscles
no crossing over |
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Term
Trigeminal system motor nucl of V
pathway?
where do fibers cross?
lesion on one side cause defect where?
clinical appearance? |
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Definition
motor nucleus of V -> via (Mandibular division of trigeminal nerve) thru foramen ovale -> muscles of mastication
Fibers do not cross
lesion on one side result in ipsilateral weakness.
opening jaw will deviate toward lesion side. |
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Term
substantia gelatinosa
what relay? |
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Definition
| involved in relaying pain & temp from below the neck |
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Term
lesion in fasciculus gracilis - what effect?
lesion in fasciculus cuneatus - what effect? |
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Definition
gracilis - ipsilateral [touch/pressure/vibration/proprioception] loss below T7
cuneatus - same effect but above T6 |
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Term
| lesion in medial lemniscus - effect? |
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Definition
| contralateral loss of [touch/pressure/vibration/proprioception] |
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Term
| lesion in spinothalamic tract |
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Definition
| contralateral loss of pain/temperature |
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Term
| lesion of principle sensory nucleus |
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Definition
| ipsilateral deficit in [touch/pressure/vibration] from face |
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Term
| lesion of trigemino-thalamic tract |
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Definition
| contralateral loss of touch/pressure/vibration from face |
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Term
| lesion to spino trigeminal tract |
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Definition
| ipsilateral deficit in pain/temp from face, teeth & anterior 2/3 of tongue & palate |
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