ANP 1106 Midterm: Revision7.5 (Motor system)

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Joanne Savory

Document Summary

The cortex sends direct (coricospinal) and indirect (coricobulbar/bulbospinal) projecions to the spinal cord. Movement is iniiated in the basal ganglia which then projects to the motor cortex. Movement is regulated by the cerebellum which then projects to the motor cortex. Primary motor cortex: precentral gyrus (4) of frontal lobe (relaionship to the primary somatosensory cortex (3,2,1) Premotor cortex: anterior to precentral gyrus (6) coordinates movement of several muscle groups simultaneously. Broca"s area: (44, 45) usually let side only, motor speech area. Frontal eye ield: (8) voluntary movements of the eyes. Descending tracts deliver eferent impulses from the brain to the. Spinal cord, and are divided into two groups. Direct pathways: equivalent to the pyramidal tracts. Motor direct pathways involve two neurons (upper and lower) Damage to either one upper of lower neuron may cause paralysis. The upper motor neuron is in the motor cortex. The lower motor neuron is a spinal motor neuron or a cranial nerve motor neuron.