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Nervous System - Part 1

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Nervous System
the sensory and control apparatus consisting of a network of nerve cells
Sensory Input
The conduction of signals from sensory receptors to processing centers in the central nervous system
Motor Output
The conduction of signals from a processing center in a central nervous system to effector cells
Central Nervous System
the portion of the vertebrate nervous system consisting of the brain and spinal cord
Peripheral Nervous System
the section of the nervous system lying outside the brain and spinal cord
Afferent/Sensory
nerve fiber which carries info towards CNS
Efferent/ Motor
carries impulses from CNS to the viscera and/or muscles and glands.
Somatic
affecting or characteristic of the body as opposed to the mind or spirit
Autonomic Nervous System
the part of the nervous system of vertebrates that controls involuntary actions of the smooth muscles and heart and glands
Neuroglia
sustentacular tissue that surrounds and supports neurons in the central nervous system
Astrocytes
largest, most numerous glial cells; maintain blood-brain barrier to isolate CNS from general circulation; provide structural support for CNS; regulate ion and nutrient concentrations; perform repairs to stabilize tissue and prevent further injury
Microglia
neuroglial tissue of mesodermal origin that can become phagocytic
Ependymal
lines the cavities of the brain and spinal cord with cerebrospinal fluid. The cilia help t circulate the cerebrospinal fluid to protect the CNS.
Oligodendrocytes
glia cells that surround and insulate certain axons in the vertebrate brain and spinal cord
Schwann Cells
Supporting cells of the peripheral nervous system responsible for the formation of myelin.
Satellite Cells
surround neuron cell bodies in glanglia; protects and regulates nurtients for cell bodies in ganglia
Cell Body
largest part of a typical neuron; contains the nucleus and much of the cytoplasm
Dendrites
branching extensions of neuron that receives messages from neighboring neurons
Axons
a part of a neuron that carries impulses away from the cell body