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27 Cards in this Set
- Front
- Back
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The Central Nervous System contains?
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Brain & Spinal cord
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The Peripheral Nervous System contains?
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1. Cranial Nerves
2. Spinal nerves 3. Ganglia |
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Functional organization of the Nervous System
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1. Sensory
2. Motor |
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Sensory
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* Afferent
-Somatic sensory -Visceral Sensory |
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Motor
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* Efferent
-Somatic Motor -Autonomic Motor |
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Somatic Sensory
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Skin, joint, special senses
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Visceral Sensory
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Receives info from viscera
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Somatic Motor
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Voluntary, controls skeletal muscles
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Autonomic Motor
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* Involuntary
* Cardiac & smooth muscle * Glands |
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What are the 2 cells of the Nervous system?
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1. Neurons
2. Glial cells |
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What are some characteristics of Neurons?
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- 100 billion in your body
- long lived - Communicate cia electrical signals called action potentials |
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What are the 3 components of neurons?
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1. Cell body
2. Dendrites 3. Axon |
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What do Dendrites do?
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Receive information from other cells
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What do Axon's do?
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Send information to other cells. (usually in the form of action potentials)
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What are some characteristics of glial cells?
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- 900 billion
- support & protect neurons - do not fire action potentials. |
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What are the 4 types of Glial cells?
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1. Astrocytes
2. Ependymal cells 3. Oligodenrocytes 4. Neurolemmocytes |
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Astrocytes
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* Help form blood brain barrier. Protects neurons from toxins in blood.
(most abundant glial cell) |
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Ependymal cells
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* Produce cerebrospinal fluid (CSF)
- line ventricles |
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Oligodendrocytes
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* Myelinate axons in CNS
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Neurolemmocytes
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* Myelinate axons in PNS
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What are the 3 CT layers of a Nerve?
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1. Endoneurium
2. Perineurium 3. Epineurium |
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What is the Endoneurium?
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A delicate layer arround a single axon
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What is the Perineurium?
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Surrounds a fascicle
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What is the Epineurium?
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Tough CT layer around a nerve
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What is a Fascicle?
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A bundle of axons within a nerve.
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What is a Synapses?
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- Connection between a neuron & another cell.
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How do Neurons communicate?
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At a synapse with molecules called neurotransmitters.
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