BISC 230Lgx Lecture Notes - Lecture 7: Lamellar Corpuscle, Bony Labyrinth, Olfactory Nerve
9 Apr 2016
School
Department
Course
Professor
Document Summary
Labeled line system: o sensaions from the opic nerve are visual, auditory info comes from the ears only. Sensory receptors = transducers: o convering physical energy (light, pressure, warmth) into neural acivity (graded potenial) or acion potenials. Olfactory nerve info goes straight to the olfactory cortex. Others go via thalamus (control center) to their primary corices: gustatory, primary somaic sensory, auditory, or visual cortex. In the epidermis: o free nerve endings - pain and temp. Pacinian corpuscle - responds best to vibraion, pressure. Wrapping, pushing on it stretches the nerve membrane, allows na+ to go through channels o. Recepive ield: the part of the world to which the receptor responds o o. Ex: visual recepive ield is what"s in front of you, somatosensory recepive ield is the place on your skin that is simulated. When a neuron"s recepive ield"s center is simulated, there is a response. Even when there is no simulus, there is sill some acivity - spontaneous acivity.
