PSYC 215 Chapter Notes -Postcentral Gyrus, Golgi Tendon Organ, Cortical Column
12 Mar 2014
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Miss c was born with analgesia, insensitivity to pain; she could not sneeze, cough, gag or blink reflexively. She often suffered injuries such as biting her tongue when chewing, and died at 29 from infections that may have been preventable if she sensed pain: social functions such as pleasant touch, controlling body posture and movement. The somatosensory system kinesthesis seem largely invisible, because they are unconscious. In the case of ian waterman, who lost proprioception after a flu-like illness, he lost all ability to control his movements. He must constantly monitor his movements visually, and study unfamiliar environments beforehand in order to navigate them. Vestibular system not included: both also depend on muscle spindles, joint receptors, and golgi tendon organs. Physiology of somatosensation: the somatosensory receptors include 8 receptors, and 2 pathways to the primary somatosensory cortex. Somatosensory receptors: sensory nerve fibers are usually pseudounipolar, having one extension which splits into a dendrite- like part, and an axon-like part.
