PS262 Study Guide - Final Guide: Nociceptor, Mechanoreceptor, Proprioception
Document Summary
Cutaneous sensations: responsible for perceptions such as touch and pain. Proprioception: ability to sense position of body and limbs. Kinesthesis: ability to sense movement of body and limbs. Mechanoreceptors: respond to mechanical stimulation like pressure, stretching, vibration, 4 types: Merkel - slow adapting-small rf- fine details. Meissner- rapid adapting - small rf- controlling hand grip. Ruf ni- slow adapting- large rf- stretching of skin. Pacinian - rapid adapting- large rf- rapid vibrations and fine texture: slow adapting: Respond with bursts of ring just at onset/offset of stimulus. 2 pathways: touch and proprioception: medial leminscus, temperature and pain: spinothalamic. Then to parietal cortex - area s1/s2. Homunculus: topographically mapped, magni cation error - disproportionate cortical representation. Two point threshold: minimum separation between 2 points on the skin that when stimulated is perceived as 2 points. Spatial cues: large surface elements that can be felt when skim moves across surface, and when skin is pressed onto the elements.
