Nervous System Flashcards
Central NS consists of
brain and spinal cord
2 parts of peripheral NS
motor (efferent) and sensory (afferent)
Somatic NS controls
sk mus contractions, consciously controled
Autonomic NS controls
sm muscle contractions and is unconsciously controlled
2 parts of the autonomic NS
sympathetic and parasympathetic NS
Sympathetic NS increases in activity
during stress/excitement
Parasymphatetic NS increases in activity
during rest and relaxation
Sympathetic NS neurons:
short preganglionic neurons and long postganglionic neurons
Parasympathetic NS neurons:
long preganglionic neurons and short postganglionic
Sympathetic NS preganglionic neurons extend from
spinal cord
Parasympathetic NS preganglionic neurons extend from
brainstem
the relative amount of stimulation by symp NS and parasymp NS in the body
autonomic tone
fight or flight response is due to
symp NS
rest and digest is due to
parasymp NS
Autonomic tone is regulated by
hypothalamus