PS102 Lecture Notes - Lecture 15: Semicircular Canals, Parietal Lobe, Sensory Cortex
Document Summary
Chemical sense: rely on chemical molecules not a form of energy . Taste: chemical receptors taste buds consists of several receptor cells, about 9,000 taste buds grouped in different regions, located on edges and back of tongue. Smell/olfaction: receptors line upper nasal cavity, about 40 million receptors, have receptor sites that resemble neurotransmitter binding site, odour molecules lock into certain sites. Sensitive to 4 tactile sensations: pressure, pain, warmth, cold. Skin is largest organ in body: contains variety of receptor structures. Pain and temperature: free nerve ending receptors beneath skin"s surface. Touch and pressure: nerve fibres at base of hair follicles. Sends messages to somatic sensory cortex (in the parietal lobe) Kinesthetic sense knowing the position of the various parts of the body: based on information from tendons, muscles and joints. Vestibular sense detects movement and provides information about the body"s orientation in space and sense of balance: based on receptors in semicircular canals of inner ear.
