PSYB65H3 Chapter 5: The Sensorimotor System
Document Summary
Somatosensory feedback: monitor the position and placement of our body and its parts; joints, tendons, muscles and skin. Somatosensory information from skin joints and muscles ensures your brain makes accurate movements: without it dont know if your grasping something too hard, knowing when to stop or start, y speed or direction of movement. Receptors: nociception: sensation of pain and temperature, hapsis: fine touch and pressure, proprioception: awareness of body and its position in space, mechanoreceptors: distortion like bending or stretching, around hair follicle y most axons have ion channels. Spinal segments: cervical (1-8), thoracic (1-12), lumbar (1-5) sacral (1-5) Dermatomes: different areas of skin that a dorsal root innervates; If cut lose some sensation but there is overlap so must cut one above and below to loose all sensation. The real world: chicken pox, shingles, and dermatomes: chicken pox virus still lives in nerves and events that compromise immune system can result in shingles.
