NSCI 324 Lecture Notes - Lecture 2: Proprioception, Golgi Tendon Organ, Motor Neuron
27 Feb 2017
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Document Summary
Anatomical organization - physiological properties: muscle receptors, afferent size and conduction velocity. Refers to the sense by which contact by the body is perceived consciously. Stretch of membrane opens channels permitting na+ to enter cell. If sufficiently large, they create an action potential. Sensory receptor attributes: intensity: discharge increases with stimuli (rate coding, modality: percept is constant for a given receptor, duration, location: each black dot represents receptive field for a single afferent (multiple receptors) Hair follicle receptor: rapidly adapting small receptive field. Each black dot represents receptive field for a single receptor. Back dots denotes high sensitivity and grey region denotes low sensitivity for receptive field. Arrows denote direction of stretch that stimulates receptor. Percept reflects pattern of activity in all receptors. Receptive fields for a sensory afferent vary in size across body surface. Three overlapping receptive fields (a,b and c): largest response at centre of receptive field.
