PLN 103 Lecture Notes - Lecture 12: Axon Hillock, Resting Potential, Axon Terminal

• School: Ryerson University
• Department: Physiology
• Course: PLN 103
• Professor: Juliatotosydezepetnek

Document Summary

Cannot divide and limit ability to repair post-injury. Depends on continuous supply of oxygen and glucose. Cell body (soma: large around nucleus with nucleolus, cytoplasm called perikaryon, neurofibrils extend into dendrites, mitochondria = atp, rer & free ribosomes = neurotransmitter, no centrioles cant divide. Dendrites conducts impulses toward the cell body: extend out from cell body and is 80-90% of neurons total surface area. Input zone where incoming signals from other neurons are received (dendrite and cell body) Trigger zone where action potential is initiated (axon hillock) Conducting zone part that conducts actin potential over variable distances (axon) Output zone part that releases neurotransmitters that influences other cells (axon terminal) Site where neuron communicates with another cell. Presynaptic cell sends a message (neuron) Postsynaptic cell receives the message (neuron from another type of cell) Synaptic cleft separates the two cells: neurotransmitters contained in synaptic vesicles released into synaptic.