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Unformatted text preview: 1 Introduction to Neuroscience Lecture 8: The Somatic Sensory System Reading Assignment: Bear et al., Ch. 12 CBNS 106 2 Sensation and Perception The function of each sensory system is to provide the CNS with a representation of the external world CBNS 106 3 Sensation and Perception Sensation - detection of stimulus and recognition that the event occurred. Perception - interpretation & appreciation of that event. CBNS 106 4 Sensory Systems Neurons in Sensory Systems signal events by a combination of rate, spatial and temporal codes. Intensity of stimulus - frequency (rate) of APs Spatial quality - location of activated neurons (Braille) Temporal quality - music 2 CBNS 106 5 Sensory Systems Sensory Systems: Chemical Senses (ch. 8): Smell (olfactory system) Taste (gustatory system) Auditory and Vestibular Systems (ch. 11) Visual System (ch. 9 & 10) Somatic Sensory System (ch. 12) CBNS 106 6 Introduction Somatic Sensation Enables body to feel, ache, chill Sensitive to stimuli Responsible for feeling of touch and pain Somatic sensory system: Different from other systems Receptors: Distributed throughout Responds to different kinds of stimuli CBNS 106 7 Touch Types and layers of skin Hairy and glabrous (hairless) Epidermis (outer) and dermis (inner) Functions of skin Protective function Prevents evaporation of body fluids Provides direct contact with world Mechanoreceptors Most somatosensory receptors are mechanoreceptors CBNS 106 8 Touch Mechanoreceptors (Contd) Pacinian corpuscles Ruffini's endings Meissner's corpuscles Merkel's disks Krause end bulbs...
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- Winter '08