Spinothalamic and Corticospinal Tract
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Transcript of Spinothalamic and Corticospinal Tract
SPINOTHALAMIC AND CORTICOSPINAL TRACT; COMPARISON
BAYETA, JENNICA MAYE ZARA
BSN III-I
COMPARISON
SPINOTHALAMIC TRACT Sensory pathway
Ascending pathway
Destination; thalamus
*this means that spinothalamic tract transmit information to the thalamus
CORTICOSPINAL TRACT Motor pathway
Descending pathway
Destination; spinal cord
*corticospinal tract conducts impulses from the brain to the spinal cord
COMPARISONSPINOTHALAMIC TRACT
Responsible for conduction of pain, temperature, proprioception, fine touch, crude touch, itch, and vibratory sense
Decussates at the level of spinal cord
CORTICOSPINAL TRACT
Responsible for discrete voluntary movements; precise movement of the fingers and toes
Decussates at the level of medulla oblongata
DECUSSATION
...the cross-over of the tract from one side to the other. This explains why there are instances that the left side of the body is controlled by the right brain hemisphere.
ADDITIONAL KNOWLEDGE :)
Spinothalamic tract and corticospinal tract differs in the location where each order of neuron ends.
SPINOTHALAMIC TRACT
Flow of arrangement...
1st order neuron Arise from sensory receptors of the body The fibers enter the white mater and ends at the substantia
gelatinosa, tip of posterior gray horn
2nd order neuron The fibers of 1st order neuron synapse with the 2nd order neuron at
the substantia gelatinosa These fibers then cross to the opposite side
*Pain and temperature fibers enters the lateral spinothalamic tract
SPINOTHALAMIC TRACT
*Light touch and pressure fibers enters the anterior spinothalamic tract
These tracts ascends to brainstem
*to medulla, pons and midrain
*tracts flattened in the brain stem (spinal lemniscus)
Reaches the ventral posterolateral nucleus of the thalamus and ends here
SPINOTHALAMIC TRACT
3rd order neuron Arise from the thalamus and pass through the internal
capsule
*thalamocortical fibers pass through the medial part of the posterior limb of the internal capsule
Enters the postcentral gyrus
*sensory cortex of the cerebrum
*behind the cetranl sulcus
*same humunculus arrangement (more sensitive areas in the body have a greater representation
CORTICOSPINAL TRACT
Flow of arrangement..
1st order neuron Fibers of the 1st order neuron arise from the precentral gyrus These fibers converge and enter a small area (internal capsule) After the internal capsule the fibers enter the brain stem, pons,
and medulla
2nd order neuron Fibers of the first order neurons ends when it enters the brain
stem and synapse with second order neuron The fibers pass through the brain stem then enters the spinal
cord
CORTICOSPINAL TRACT
3rd order neuron2nd order neuron fibers in the medulla enters the
spinal cord and synapse with the 3rd order neuron
CORTICOSPINAL TRACT
CORTICOSPINAL TRACT
FLOW OF ORDER NEURONS