PSL300H1 Lecture Notes - Lecture 32: Pretectal Area, Baroreflex, Postganglionic Nerve Fibers
Document Summary
Controls internal organs, blood flow, smooth muscles, etc. Involved in: exercise, emotion, eating, effect of gravity". 2 subsystems: sympathetic (fight, flight, or freeze, parasympathetic (rest and digest) Works in conjunction w/ endocrine & behavioural state systems maintain homeostasis. Pre-ganglionic neurons: in the brainstem or spinal cord: axons ganglia (b/w the cns & the target tissue) Post-ganglionic neurons: project from ganglia target tissue. Tonic (slow) activity at rest: both branches active, but pns dominates. Ans produce functional reflexes: important in negative feedback loops homeostasis, linked to sensory systems, pupillary light reflex, baroreflex. Uses on/off afferent projections, to signal luminance & darkness detectors: too bright parasympathetic reflex, 3rd cranial nerve cilliary ganglion constricts the pupil, too dim sympathetic reflex, thoracic cord sympathetic chain radial muscles. Baroreceptors detect changes in blood pressure & project to nts. Baroreceptors nts caudal vlm --| rostral vlm sympathetic effects. Autonomic control centers: hypothalamus, pons and medulla: sensory information autonomic control centers downstream effects.
