Ascending And Descending Tracts Of Spinal Cord Ppt !link! -

| Tract | Origin | Decussation | Function | Lesion Effect | | :--- | :--- | :--- | :--- | :--- | | Lateral Corticospinal | Motor cortex (area4) | Medulla (90%) | Fine, skilled movement | Ipsilateral UMN signs | | Anterior Corticospinal | Motor cortex | Spinal segment | Proximal muscles | Minimal (redundant) | | Rubrospinal | Red nucleus | Midbrain | Flexor tone | Minimal in humans | | Vestibulospinal | Vestibular nuclei | None | Extensor tone | Ipsilateral hypotonia | | Reticulospinal | Reticular formation | Mixed | Posture, locomotion | Autonomic dysfunction | | Tectospinal | Superior colliculus | Midbrain | Head/eye reflexes | Impaired orienting |

Pain, temperature (lateral); Crude touch, pressure (anterior) Spinal cord (at entry level) Spinocerebellar Posterior & Anterior Spinocerebellar Unconscious proprioception for muscle coordination Varies (often remains ipsilateral) 2. Descending Tracts (Motor Pathways) ascending and descending tracts of spinal cord ppt

Ascending pathways typically utilize a to relay information to the cerebral cortex: | Tract | Origin | Decussation | Function