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Cells of the Nervous System
Terms in this set (14)
two principal cell types compose the Nervous System (NS)
Neurons and Glia ( Glial cell or Neuroglia)
highly excitable cells capable of conducting electrochemical impulses that enable the NS's function.
do not readily conduct information. instead they support the function of neurons in a myriad of ways
the human brain is estimated to contain about 100 billion neurons, 10% of the total number of NS cells in the brain. neuron have cellular components. ex the nucleus, golgi apparatus, mitochondria, etc,
Multipolar neurons, Bipolar neurons, Unipolar neurons.
have one axon and multiple dendrites. this configuration represent the typical neuron shape in the public mind and is in the brain.
have one axon and only one branched dendrite. this the common type found in the retina, inner ear and olfactory pathway.
have only one process extending from the cell body which branches into peripheral ( away from CNS) and central ( toward CNS) processes. these are always sensory neurons in function.
Organization of the Nervous System
Central & Peripheral Nervous System, Afferent & Efferent Division, Somatic & Autonomic, Systems.
Central & Peripheral Nervous Systems
1. CNS- brain and spinal cord
2. PNS- all the remaining nerves
Afferent & Efferent Divisons
1. Afferent- oncoming sensory pathway
2. Efferent- outgoing motor pathways
Somatic & Autonomic Nervous System
1. SNS- afferent & efferent pathway to skeletal muscles.
2.ANS- afferent & efferent pathway to smooth muscle, cardiac muscle, and glands
a. sympathetic division
b. parasympathetic division
fight or flight response
rest and repair
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