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Kinesiology 1080A/B Lecture Notes - Lateral Corticospinal Tract, Alpha Motor Neuron, Corticospinal Tract

Course Code
Kinesiology 1080A/B
Matthew Heath

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Kinesiology 1080 Feb. 11, 2013
Bulb of Brainstem
- It synapses onto the alpha motor neuron via monosynaptic connection (1 corticol
neuron synapses to 1 alpha motor neuron
Rostral & Caudal Parts of the Corticobulbar Tract
- Facial nucleus is divided into rostral (innervates forehead: upper facial musculature) and
caudal (innervates mouth: lower facial musculature) parts
Rostral (Upper face)
Innervates bilaterally
It sends the projections to both sides of the body: left and right
Caudal (Lower face jaw area)
Innervates contralaterally
It sends the projections to the opposite sides of the body from the cortex
(left brain is controlling the right side of the body and vice versa)
- Tumor in cortex It is an upper motor neuron injury which involves the corticobulbar
o This results in an asymmetrical innervation of the lower facial musculature
A tumor in the right cortex will lead to a contralesional paralysis affecting the left
lower musculature. However, the upper face musculature is not affected by the
tumor because the rostral side sends signals bilaterally (both sides) and is able to
innervate the affected side
- Lower Motor Neuron Injury Bell’s Palsy (Involves the axons of the alpha motor
o Causes a complete paralysis of one side of the face
o When the lower motor neurons are impaired, no muscles in that area can be
o Both upper and lower facial musculature are affected
Corticospinal tract It has two pathways: Ventral & Lateral
Ventral Corticospinal Tract Simpler of the two corticospinal tract pathways
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