BIOS1171 Lecture 5: Week 5 Notes
4 Sep 2018
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Receptor neuron that responds to a particular type of stimulus. Adequate stimulus the stimulus most appropriate to a particular receptor. Sensation conscious experience produced by a stimulus. Sensory modality sensory system defined by the receptor and the sensation it evokes. Respond to mechanical deformation touch on the skins surface. Skins surface > epidermis > dermis (contains the receptors ruffini, merkel, meissner, pacinian) Do not cross the midline form dorsal column. Conversion of energy in external world to electrochemical energy in nerve. Graded with the size of the stimulus. Is the region of sensory surface which is controlled by a particular type of receptor. The deeper a receptor is, the larger receptive field it has. Innervation density number of receptors per unit of skin area (greatest density is in fingers, lips, tongue) When the skin temperature is greatly increased or decreased, the firing rate of action potentials increases. Crosses the midline enter the anterolateral white matter.
