Spinal Cord and PNS Flashcards
divisions of the PNS (3)
cranial nerves
somatic nervous system (SNS)
autonomic nervous (ANS)
What is innervated by the ANS?
visceral muscles, glands: cardiac muscle, lungs, GI, secretory glands
divisions of the ANS (2)
parasympathetic nervous system
sympathetic nervous system
functions of parasympathetic nervous system
rest/digest
homeostasis, slows body down, decrease BP/HR, peristalsis
neurotransmitter involved in parasympathetic system
acetylcholine
functions of sympathetic nervous system
fight/flight
arousal, increase BP/HR, stop peristalsis
termination of the spinal cord (3)
conus medullaris, cauda equina, filum terminale
level of the spinal cord that is large oval with dorsal horns larger than ventral horns
cervical
level of the spinal cord with largest amount of gray matter and ventral horns larger than dorsal horns
lumbar
level of spinal cord that is smaller oval and has lateral horns
thoracic
smallest level of spinal cord (similar to lumbar)
sacral
dermatome
a skin segment that receives its innervation from a specific spinal nerve
importance of dermatomes
localize lesion pattern in the spinal cord (highly predictable/not much variation person to person)
categories of motor neurons (2)
upper motor neurons (UMNs)
lower motor neurons (LMNs)
function of UMNs
carry motor messages from primary motor cortex to cranial nerve nuclei and interneurons in ventral horn
