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AUTONOMIC NERVOUS SYSTEM (ANS (PARASYMPATHETIC (rest & digest …
AUTONOMIC NERVOUS SYSTEM
ANS
PARASYMPATHETIC
rest & digest :sleeping_accommodation:
restore body function
Sympathetic & parasympathetic work to achieve
homeostasis
Homeostatic autonomic pathways
coordination of homeostatic responses
autonomic crtl centers of brain are HYPOTHALAMUS (water balance, temp, hunger), PONS (resp. cardiac function, urinary), MEDULLA (respiration)
SYMPATHETIC
Fight :fist-2: or Flight :runner:
energetic action
each branch can exhibit dominant crtl
Types of autonomic crtl
SINGLE INNERVATION :point_up:
Only sympathetic innervation (stim)
Ex. Blood vessels & sweat glands
RECEPTOR SPECIFICITY :hotsprings:
receptor dictates response
alpha-1 adrenergic receptor (blood vessel constricts)
beta-1 adrenergic receptor (blood vessel dilates)
ANTAGONIST CRTL :woman-wrestling: "gas pedal brake pedal"
2 inputs (dual ntervation) that are opposite (sym v. parasympathetic)
most internal organs
experience antagonist ctrl
EFFERENT NEURONS
PREGANGLIONIC
1st neuron
begins in CNS and synapses in an autonomic ganglion (cluster of cell bodies)
POSTGANGLIONIC
2nd neuron
begins in an autonomic ganglion and synapses on the target tissue
Divergence occurs here (1 neuron attaches to many)
AUTONOMIC GANGLIA
Sympathetic
preganglionic neurons originate from thoracic and upper lumbar S.C. (INNER)
Ganglia lie just outside of SC
Parasympathetic