BSC 228 Lecture Notes - Lecture 6: Neuromuscular Junction, Nociceptor, Osmoreceptor
Document Summary
Information carried toward cns: from viscera, from surface areas, somatic sensation - includes somesthetic sensation (skin) and proprioception (muscles, joints, inner ear, special senses - vision, hearing, taste, smell. Perception: our conscious interpretation of the world created by the brain from a pattern of nerve impulses from sensory receptors: receptor physiology. Protective (tissue damage is occurring or about to occur) - 3 categories of nociceptors: mechanical 2. thermal, polymodal. Sensitized by prostaglandins (fatty acid derivatives from lipid bilayer, act locally) - fast pain pathway: from mechanical and thermal nociceptors on large, myelinated fibers 2. localized, sharp sensation. Slow pain pathway: from polymodal nociceptors on small, unmyelinated c fibers, dull, aching, poorly localized sensation, activated by chemicals released from damaged tissue(e. g. , bradykinin) Autonomic nervous system: involuntary, innervates cardiac and smooth muscle, glands - somatic nervous system, voluntary, innervates skeletal muscle - two neurotransmitters, acetylcholine (ach) 2. norepinephrine (ne, ans. Ach: postganglionic fibers are short, end on the effector organ (release ach)
