NSCI 324 Study Guide - Midterm Guide: Time Point, Lidocaine, Dysmetria
27 Feb 2017
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Hair receptor cells rapid (small receptor field) Merkels disks shape, pressure, position (sharp) superficial slow high tpd. Meissners corpusles light touch (low thresh) superficial rapid high tpd. Ruffini endings stretch (directional) deep slow. Pacinian corpuscle vibration deep rapid (large receptor field) Primary afferent muscles spindles: stretch velocity (faster stretch = more aps) Secondary afferent muscle spindles: length (longer muscle = more aps) (muscle shortens = no aps) Gamma motoneurons: increase the sensitivity of muscle spindles to detect tiny changes. Golgi tendon organ: muscle tension, force (involved with the interpretation of effort: gto stretch reflex response (sc): provides inhibitory feedback to agonists and excitation to antagonists i. e. think of holding a weight that is too heavy. Dorsal column - medial lemniscus pathway: cutaneous touch, proprioception. Stereognosis: the ability to recognize an object by touch (haptic perception) Graphesthesia: the ability to recognize letters and numbers if somebody writes.
