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12 Cards in this Set
- Front
- Back
Nervous tissue is made up of two basic types of cells (also their function (1) each)
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1) Neuron - functions for communication
2) Glial Cells - function for support of neurons |
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Divisions of Nervous System (3)
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1) Central Nervous System - includes brain, spinal cord, optic nerve, and retina
2) Peripheral Nervous System - includes nerves projecting out of and into brain and spinal cord, peripheral ganglia, and communicating nerves between peripheral ganglia 3) Autonomic Nervous System - Sympathetic and Parasympathetic part of PNS (extends into PNS) |
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How many neurons are in the brain alone and what do they do
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-10^12 in brain alone, many more in rest of nervous system.
-They process and convey information/signals -Very involved in their own maintenance. Make their own proteins for export |
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Neurotransmitters are...
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chemical signals passed between neurons at synapses
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Which direction do dendrites and axons carry impulses. What components do these two have?
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Dendrites carry impulses toward cell body
Axons carry impulses away from cell body - from the soma to the periphery. Both have complex cytoskeleton of neurofilaments, microtubules, and microfilaments but many fewer organelles than soma. |
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Components of Neurons (1, it has 5 components)
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Cell body (soma/perikaryon) containing nucleus, RER (Nissl substance), Golgi, mitochondria, and cytoskeleton
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Axon Hillock and its relation to dendrites
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-Pyramidal portion of soma where it joins with axon is called axon hillock. Does not contain Nissl substance.
-Dendritic inputs are summed at hillock and may result in propogation of nerve impulse down axon. |
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Anterograde Flow and how is it run
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Organelles and macromolecules made in soma are transported down axon. Driven by ATPase, microtubule-associated protein kinesin:
-slowly (about 2 mm/day; proteins and actin filaments) -rapidly (200 mm/day; mitochondria, vesicles of neurotransmitters) |
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Retrograde flow - how is it run and what does it carry
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Driven by ATPase, microtubule associated protein dynein (moves synaptic vesicles)
Carries e.g. endocytic vesicles from axon terminus back toward soma for reloading with neurotransmitter. |
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Types of Neurons (3)
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Multipolar - most are this type, have many dendrites and an axon or two, soma w/lard number of processes, ex. in motor horn of spinal cord.
Bipolar - some are this, with one dendrite and one axon, ex. in retina Pseudounipolar - some are this, ex. sensory neurons in doral root ganglia |
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Components of Grey and White Matter, and Central Canal
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-"Butterfly" of Grey matter has abundance of neuron cell bodies, some myelin, and glia
-White matter has few neuron cell bodies, lots of myelin, and glia -Central canal, filled with CSF, lined by ependymal cells (glia) |
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Posterior (dorsal) horns and Anterior (ventral) honrs - components and function
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Posterior (dorsal) horns have sensory neurons receiving sensory input from neurons with cell bodies in dorsal root ganglia and dendrites on end organs, ex. skin
-Anterior horns have motor neurons sending out axons to innervate peripheral skeletal muscle |