PSYC 3270 Lecture Notes - Lecture 5: Naloxone, Nociceptor, Proprioception

• School: York University
• Department: Psychology
• Course: PSYC 3270
• Professor: Laurie Wilcox

Document Summary

Epidermis the heaviest organ in the body. Below the epidermis contains mechanoreceptors: pressure (merkel receptor, stretching (ruffini cylinder, vibration (pacinian corpuscle) Densely packed on the finger tips (like cones in the fovea) Merkel receptor: fires to continuous pressure, fine details. Two-point thresholds: fires to on" & off", controlling hand-grip. Ruffini cylinder: fires to continuous pressure, stretch. Pacinian corpuscle: fires to on" & off", rapid vibration & fine texture. Nerve fibers travel in bundle (peripheral nerve) to the spinal cord. Two major pathways in the spinal cord: medial lemniscal pathway. ++ cross-over also happens within the spinal cord: cross over & synapse in the thalamus. S1 (somatosensory receiving area; parietal lobe) . Body map: homunculus, on the cortex in s1 (dorsal) & s2 (ventral, plasticity in neural functioning leads to . Apply a grooved stimulus on the skin . And then figure out the orientation of the grating: raised pattern identification.