PSYC 106 Lecture Notes - Lecture 13: Nociception, Receptive Field, Solitary Tract
Document Summary
Gustation and olfaction are important because they control feeding behaviors. Located on tip of tongue: foliate papillae- innervated by facial nerve and glossopharyngeal nerve. Located on sides of tongue: circumvallate papillae- only have 10-14; innervated by glossopharyngeal nerve. Located on back of tongue areas located behind circumvallate papillae are primarily used for brainstem-based reflexes like swallowing (ingestion) and gagging (rejection) also have taste buds on cheeks and throat taste buds are located in grooves of papillae. This causes a depolarization, which leads cranial nerve to generate an action potential and send it to brain: one trc may not necessarily have receptors for all tastes. Taste also controlled by general sensory receptors which transduce chemical, thermal, and physical properties of food: ex) capsaicin-sensitive neurons are nociceptors and contain thermosensitive. Trpv1 receptors that respond to the presence of spices like capsaicin (found in chili peppers: ex) salt intake- necessary for survival, but levels must be controlled.
