KINESIOL 2Y03 Lecture Notes - Lecture 10: Axon Hillock, Chemical Synapse, Axon Terminal

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blushfrog931

13 Feb 2018

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Lecture 10 organization + cells of nervous system. Neuroglia (glial cells: non neural cells, cannot receive or send an action potential, supports and protects neurons, found in both the cns and pns. In the trigger zone is where we would create the action potential: axon branches into axon terminals. Synaptic end blub or presynaptic terminal: enlarged regions at the end of axon terminals. 2: one single schwann cell but will run the entire length of the axon, node of ranvier. In between of the cells, we have an exposed region that is unmyelinated. Neuron structure: dendrites come into contact with the axon terminals of other neurons. Start of the axon initial segment: diameter of axon is constant, but length can vary from mm up to 1m, different neurons may have different diameters. Axonal transport: axons create vesicles in presynaptic terminal or store them there.

Related Questions

Nerve cells that conduct messages are called (1) ____. (2) _____ cells, which support and nurture the activities of neurons, make up less than half the volume of the nervous system. (3) _______ neurons respond to specific kinds of environmental stimuli, (4) ______ connect different neurons in the spinal cord and brain, and (5) ______ neurons are linked with muscles or glands. All neurons have a (6) _______ ________ that contains the nucleus and the metabolic means to carry out protein synthesis. (7) _______ are short, slender extensions of the (6), and together these two neuronal parts are the neuronsâ âinput zoneâ for receiving (8) _____. The (9) _____ is a single long, cylindrical extension away form the (10) ______; in motor neurons, the (11) ______ has finely branched (12) ________ that terminate on muscle or gland cells and are âoutput zones,â where messages are sent on to other cells. A neuron at rest establishes unequal electric charges across its plasma membrane, and a(n) (13) ____ ____ is maintained. Another name for (13) is the (14) _____ _____ _____; it represents an ability for the membrane to be disturbed. Weak disturbances of the neuronal membrane might set off only slight changes across a small patch, but strong disturbances can cause a(n) (15) _______ ______, which is an abrupt, short-lived reversal in the polarity of charge across the plasma membrane of the neuron. For a fraction of a second, the cytoplasmic side of a bit of membrane becomes positive with respect to the outside. The (16) ______ that travels along the neural membrane is nothing more than short-lived changes in the membrane potential. A. Neurons H. Sensory B. Motor I. Endings C. Interneurons J. Disturbance D. Cell body K. Signals (stimuli) E. Axon L. Voltage differential F. Dendrites M. Resting membrane potential G. Neuroglial N. Action potential

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KINESIOL 2Y03 Lecture Notes - Lecture 10: Axon Hillock, Chemical Synapse, Axon Terminal

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