PSY 201 Lecture Notes - Lecture 3: Axon Terminal, Membrane Potential, Myelin
Document Summary
The action potential: summary: resting membrane potential 70mv, neurotransmitter binds at dendrite, some na+ enters cell, threshold of excitation at 65mv, na+ channels open / na+ influx. Internal charge: 079 to +55: depolarization: at +55mv k+ channels open / k+ efflux. Internal charge: -55 to -90: hyperpolarization: cl- channels open; cl- efflux, internal charge returns to 70mv. Myelin: aids in facilitating action potential. Nodes of ranvier: small, open gaps without myelin. Saltatory conduction: ap"s reproduced at nodes of ranvier. Ap triggered in next neuron (or prevented) 2/9/16: movement, autonomic functions, learning, and memory, deficiency in alzheimer"s. Glutamate (glu): excitatory, excitatory control over cns, learning and memory, depression, gaba. Dopamine (da: excitatory, motivation, reward, planning of behavior, deficiency in parkinson"s, excess in schizophrenia. Serotonin (5-ht): excitatory, mood, appetite, sleep, deficiency in depression/anxiety. Cerebral cortex: outer layer of the brain, contains 70% of neurons in cns, wrinkled, 2 hemispheres: left and right. Primary somatosensory cortex (s1: receiving area for bodily sensations.
