nervous system A+P CH.9 lecture 7
motor system
somatic motor system and autonomic NS
cerebral cortex
somatic motor system
controls voluntary movements under orders from cerebral cortex
plan sent to primary motor cortex located in prefrontal gyrus
subcortical structures
plan for movement leaving motor cortex and connects with neurons in thalamus, located in diencephalon
cerebellum
gets information about planned movement and actual movement and compares them if it doesn't match cerebellum can adjust movement to plan
spinal cord pathways
corticospinal and corticobulbar tracts from motor cortex are direct pathways carrying orders to neurons in brain stem and ventral horns of spinal cord
2nd function
fine tuning of reflexes, tracts inhibits reflexes, making them softer than they would be without influence on brain.
motor pathologies
cerebral palsy
permanent, non-progressive set of motor deficits diagnosed in infants
parkinsons disease
chronic progressive motor disease
amyotrophic lateral sclerosis (ALS)
lou Gehrigs disease, rapidly progressive, fatal degeneration of motor system
autonomic NS
divided into
somatic system
controls skeletal muscles
autonomic system
involuntary muscles, controls physiological characteristics
divided into
sympathetic division
parasympathetic division
"flight or fight", responding to emergencies
resting and digesting