PHAR 340 Lecture Notes - Lecture 15: Medulla Oblongata, Solitary Tract, Posterior Grey Column
23 Dec 2018
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Ans basic info 3 branches= sns, pns, enteric. Somatic innervates skeletal, autonomic innervates smooth muscle, epithelia + glands. Activation: constriction, saliva incr, eyes accommodate for near vision, hr decr, gi tract act incr, bladder sphincter tone decr and detrusor incr. Fight or flight, act during exercise, excitement and emergencies. Innervate same organs as pns but has opposing effects, each brain is tonically active. Act: less saliva, bronchi dilate, skin perspires, liver glycogenolysis, gi act decr, fat tissue lipolysis to free fatty acids, hr and contractility incr, bladder is opp, cns more active, pupils dilate. Homeostasis: stim prod change in variable, change detected by r, input info sent along afferent pathway, perturbation of homeo, detection and transmiss of changes to cns via neural(vagal. Dec in bp act sns: medulla synapse in symp chain gang incr hr + bp. Stim slows hr, nerve excitation leads to depolarization of nerve terminal to release nt.
