PSYC 101 Lecture Notes - Lecture 9: Lamellar Corpuscle, Proprioception, Hair Follicle
Document Summary
Psyc 101 lecture 9 sensations and perceptions 2. Touch: the skin has three layers, the outermost layer is a thin film of dead cells containing no receptors. In the middle and fatty layers of skin are a variety of receptors with different functions. Merkel"s disks sense pressure on the skin; Free nerve endings one of their major functions is to transmit information about temperature and pain. Also called the somatosensory system: skin is the body"s largest organ, sense of touch encodes in two ways: weight and location. Intensity measures how heavy a stimulus is. Number of nervous firing and firing rate: location is based on which nerves are firing. Receptors spinal cord thalamus somatosensory cortex. Somatosensory cortex is mapped liked the surface of the skin. Sensing temperature: thermoreceptors sensory nerves endings under the skin that respond to changes in temperature at or near the skin and provide input to keep the body"s temperature around.
