NROC64H3 Lecture Notes - Lecture 5: Medial Lemniscus, Spinothalamic Tract, Spinal Cord
17 Mar 2012
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Document Summary
Body able to feel itself & environment, ache chill. Somatic sensory system: different from other systems receptors: distributed throughout and respond to different types of stimuli. Types of layers of skin hairy and hairless/glaborous, epidermis/outer and. Functions: protect, prevent evaporation, provide direct contact with world. Pacinian corpuscles, ruffini"s endings, meissner"s corpuscles, merkel"s disks, Skin slip, 1st contact, pattern texture recognition, lateral stretch, hand shape. Onion-like encapsulation of pacinian corpuscles capacity, convergence, receptive field size, special mechanisms. Includes gray matter, white matter, dorsal root, dorsal root ganglion, central root, spinal nerve and the sensory receptor. Spinal cord: spinal segments (30) spinal nerves, w/i 4 decisions. Spinal cord ends ~3rd lumber vertebra: cauda equine, lumbar puncture, anaesthetics. Dermatones: area of skin innervated by dorsal roots of 1 spinal segment, 1-1 correspondence, shingles, herniated disk. Sensory organization of sc: division of spinal gray matter: Dorsal horn, intermediate zone, ventral horn - myelinated. 3a, 3b: primary brodmann"s area 3b/s1:
