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Descending Tracts (Dorsolateral (Rubrospinal (Flexors, Decerebrate vs.…
Descending Tracts
Dorsolateral
Rubrospinal
Flexors
Decerebrate vs. decorticate
Midbrain decussation
Distal, fine movements
Lateral Corticospinal
Skilled movement-typing
Individual joints
Movement of contralateral limb
Transection above decussation = Contralateral spastic paresis and positive Babinski's
Ventromedial
Vestibular
No decussation
Balance and sudden posture
Tectospinal
Exception: Decussates in midbrain
Head and eye movement
Flinching
Reticulospinal
No decussasion
Waking up
Postural and Girdle movements. Righting reflexes. Large movements of proximal muscles
Lower Motor Neurones
PNS: Cranial and spinal nerves
Muscle projection
Brainstem cranial nuclei
Lesion in UMN leads to hyperflex activity lower down due to loss of modulation by UMN