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Spinal Cord Tracts, Dorsal Column-Medial Lemniscus
Pressure, Touch,…
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Dorsal Column-Medial Lemniscus
Pressure, Touch, Vibration, Proprioception
Left Fasciculus Gracilis
Sensation Below T6
Left Side Shown
LEFT Below T6 Doral Root Ganglion
Ipsilateral Vibration / Proprioception
HERE 1st Order Cell body1st Order neuron pass to Left medial Fasciculus Gracilis
Pressure, Touch, Vibration, Proprioception Below T6
LEFT SIDE OF BODY
RIGHT Fasciculus Gracilis
Sensation Below T6
Left Side Shown
Right Below T6 Doral Root Ganglion
Ipsilateral Vibration / Proprioception
HERE 1st Order Cell body1st Order neuron pass to Right medial Fasciculus Gracilis
Pressure, Touch, Vibration, Proprioception BELOW T6
RIGHT SIDE OF BODY
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Left Caudal Medulla
Primary Axons from the periphery travel all the way to synapse to their respective nuclei of the caudal medulla. Rostral Fibers (Cuneatus) remain Separate from Caudal Fibers (Gracilis)
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Right Caudal Medulla
Primary Axons from the periphery travel all the way to synapse to their respective nuclei of the caudal medulla. Rostral Fibers (Cuneatus) remain Separate from Caudal Fibers (Gracilis)
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Ascending AND Descending Fibers Converge and Form the
Left / RIght Corona Radiata
Ascending
:arrow_up:
Left / Right Postcentral Gyrus
Somatosensory Cortex
Sensation from CONTRALATERAL side of Body
Descending
:arrow_down:
Left / Right Precentral Gyrus
Primary Motor Cortex
Voluntary Movement
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Internal Capsule of Thalamus
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Descending
:arrow_down:
Anterior and Lateral corticospinal Tract
Skilled movements and postural adjustments
Left Descending Fibers
descend through Posterior Internal Capsule directly inferior to the VPL of the thalamus
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Right Descending Fibers
descend through Posterior Internal Capsule directly inferior to the VPL of the thalamus
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Ascending
:arrow_up:
Spinothalamic Tract (Pain, Touch, Temperature)
Dorsal Column Medial Lemniscus (Proprioception, Vibration)
Left / Right Posterior Limb of Internal Capsule
:arrow_up: and :arrow_down: fibers both pass through the Posterior aspect of the Internal Capsule
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Spinothalamic Crossover
Anterior White Commissure
2nd order Neurons Cross here
and Enter Spinothalamic Tracts
LEFT Spinothalamic Tract
Contralateral
Pain and Temperature
from Right Side of Body
Left Caudal Medulla
Anterolateral Spinothalamic Tract travels adjacent to the pyramids
Left Rostral Medulla
Anterolateral spinothalamic tract is between the inferior olivary nucleus and the nucleus of the spinal tract of the trigeminal nerve
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RIGHT Spinothalamic Tract
Contralateral
Pain and Temperature
from Left Side of Body
Right Caudal Medulla
Anterolateral Spinothalamic Tract travels adjacent to the pyramids
Right Rostral Medulla
Anterolateral spinothalamic tract is between the inferior olivary nucleus and the nucleus of the spinal tract of the trigeminal nerve
Right Pons
The spinothalamic tract lies just lateral to the medial lemniscus of the posterior-column medial lemniscus ascending tract
Right Midbrain
Spinothalamic tract is just posterior to the medial lemniscus of the posterior column-medial lemniscus ascending tract
Right Dorsal Column Medial Lemniscus
Left Sided Proprioception, Vibration
Right Ventral Posterolateral Nucleus of the Thalamus
2nd Order Neuron Synapses hereHere 3rd Order Cell body
Right Spinothalamic Tract
Left Sided Pain, Touch, Temperature
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PAIN / TEMP/ TOUCH LEFT SIDE OF BODY
LEFT Meissner's Corpuscle - Dynamic Deformation (slipping object)
LEFT Ruffini Ending - Skin Stretching
LEFT Merkel's Disk - Pressure, Position, Deep static touch for form and texture detection
LEFT Pacinian Corpuscle - Vibration
LEFT Doral Root Ganglion
Ipsilateral Pain Temperature
HERE 1st Order Cell body1st Order neuron pass through Lissauer's tract to Synapses @ LEFT Posterior Horn 2 levels up
Left Lissauer's Tract
Neuron Travels UP/DOWN TWO LEVELS -
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+/- 2 LevelsLEFT Posterior Horn - Substantia Gelatinosa
1st Order Neuron Synapses here
HERE 2nd Order Cell body
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PAIN / TEMP/ TOUCH RIGHT SIDE OF BODY
RIGHT Meissner's Corpuscle - Dynamic Deformation (slipping object)
RIGHT Ruffini Ending - Skin Stretching
RIGHT Merkel's Disk - Pressure, Position, Deep static touch for form and texture detection
RIGHT Pacinian Corpuscle - Vibration
RIGHT Doral Root Ganglion
Ipsilateral Pain Temperature
HERE 1st Order Cell body1st Order neuron pass through Lissauer's tract to Synapses @ LEFT Posterior Horn 2 levels up
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DCML CROSSOVER
Internal Arcuate Fibers
Are formed by the Cuneatus and Gracilis Nuclei fibers after they cross the midline. They then form right and left medial lemniscus
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Corticospinal Tract Crossover
Decussation of the Pyramids
Only Fibers Joining the Lateral Corticospinal Tract Cross Here
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Made to help visualize the path that a signal will take from the cortex down to a motor unit (on the Left). Start at the bottom of diagram for sensory input --> cortex.
Or from a sensory cell up to the cortex (on the right). Start at the top of the diagram for motor cortex --> motor unit.
The specific spinal cord sections are highlighted if you zoom in to the image.