ANS A&P Flashcards
origins of parasympathetic ANS
craniosacral regions of CNS- brainstem to cranial nerves and sacral spinal cord to ventral roots
location of parasympathetic ganglia
near the target tissue
origins of sympathetic
thoraco-lumbar regions of spinal cord house preganglionic cell bodies, axons exit via ventral roots
3 synapse options for preganglionic axons for sympathetic - where are the postganglionic cell bodies?
symp chain ganglia near spinal cord (paravertebral), prevertebral ganglia more distal than the chain, adrenal medulla chromaffin cells
NTs involved in sympathetic
ACh to N receptors as postganglion cell body, NE to adrenergic at effector cell
NTs involved in parasympathetic
ACh to N receptors on postganglion cell bodies, ACh to M receptors on effector cells
why are sweat glands unique?
sympathetic innervation uses ACh instead of NE, does have adrenergic appocrine fn starting in puberty
sympathetic innervation of renal vessels and SM?
dopamine to D1 receptors instead of NE
alpha2 effects
presynaptic- inhibition of NE exocytosis via negative feedback
postsynaptic (minor)- SM contraction
type of control in parasympathetic
discrete control- each organ separately regulated
type of control in sympathetic
mass discharge of multiple systems at once, innervation of vessels
synergistic dual ANS innervation ex
salivary gland and sexual fn- paRasympathetic=eRection and sympathetic= ejaculation
sympathetic only systems
sweat glands, pilomotor of skin, arterioles, veins
list 3 muscles in micturition and their innervations
detrussor- PS
Internal urethral sphincter- sympathetic
External urethral sphincter- somatic motor
(think logically, in fight or flight want to relax bladder SM (detrussor) and contract sphincter so we dont pee)
2 baroreceptors
aortic arch and carotid sinus
