PSYC55H3 Study Guide - Midterm Guide: Receptive Field, Jerky, Orbitofrontal Cortex
Document Summary
Neurons: cells that transmit information throughout the nervous system: most neurons consist of a cell soma (body), axon, and dendrites. Dendrites: branching extensions of the neuron that receive inputs from other neurons. Spines: little knobs attached by small necks to the surface of dendrites, where the dendrites receive inputs from other neurons. Comprise most of the receptive surface of a neuron. Transmits electrochemical signals: cell body synapse. Axon collaterals: branched axons that can transmit signals to more than one cell. Allows for the rapid transmission of action potentials down an axon. Nodes of ranvier: spaces between sheaths of myelin where voltage-gated na+ and k+ channels are located and action potentials occur. Interneuronal contact: nearly all neurons are both pre- and postsynaptic since they both receive and transmit information. Presynaptic cell is located before the synapse with respect to information flow. Postsynaptic cell is located after the synapse with respect to information flow. Interneurons: associate information within the central nervous system.
