PSYC 1010 Lecture Notes - Peripheral Nervous System, Wilder Penfield, Motor Cortex

• School: York University
• Department: Psychology
• Course: PSYC 1010
• Professor: all

Document Summary

Neurons: neurons pile up, never by themselves, never any contact between neurons, but they are very close, cell body sends impulses down the axon towards the terminal branches. Glial cells support, nourish and protect: surround neurons and hold them in place, manufacture nutrient chemicals neurons need, absorb toxins and waste materials. Myelin sheath- fatty insulation layer, insulates axons and speeds their impulses. Action potential (positive ions come in and out) (depolarization: brief electrical charge that runs down its axon. Synapse- is a junction between the axon tip of the sending neuron and the dendrite or cell body of the receiving neuron (also known as the synaptic junction or the synaptic gap) Effect of neurotransmitters (chemical released that bind to receptor sites on the receiving neuron: excitatory. Inhibitory: stimulates ion channels to allow k+ to flow out, decreases likelihood of action potential.