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27 Cards in this Set

  • Front
  • Back
CNS
brain and spinal cord
PNS
all of the nerves that conduct impulses in and out of the brain and spinal cord
PNS is divided into 2 parts
Somatic and autonomic
Autonomic
all of the nerves that conduct impulses to and from smooth muscle, cardiac muscle, and glands
somatic
conduct impulses to ans from skeletal muscles
Autonomic contains 2 division
sympathetic and parasympathetic
Sympathetic
Emergency nervous system, flight or fight, and speeds up all the body activity
Parasympathetic
House keeping. maintains normal body activities
Neuron
highly specialized nerve cell that transmit impulses called action potential
3 types of neurons are
Sensory, motor, association
Sensory
Conduct action potential from inside and outside of environment into the central nervous system called afferent
Motor
Conduct action potential from motor cortex of brain out to effectors (muscles)-efferent!!
Association
Internuncial and interneuron located in the connecting neuron that connects sensory and motor neurons
Dendrites
Nerve fibers that receive impulses from other neuron of from the encivronment and move them toward the cell body
Cell body (soma or perikaryon)
where you find cytoplasm and most of the organelles
Chromatophyllic substances
(nissl body) rough endoplasm reticulum
Neurofibrils
Protein structures that support the cell body and give its shape
lipofuschin pigment
givrs the cell body its yellowish color
Axon Collateral
Side branches also begin after it triggers
neuroglia
nerve tissue that insulates, protect, nurishes, support neuron
Types of neuroglia
6 types of glial cells, 4 of them are the only in CNS, 2 of them are only in PNS
1st type of neuroglia (in CNS)
Ostrocytes
make neurotransmitter: also maintain potassium ion balance which is required to conduct nerve impulses
2nd type of neuroglia (in CNS)
Oligodendrocytes
Produces myelin: fatty insulator that covers axons
3rd type of neuroglia (in CNS)
Microglia
phagocytes: destroys bacteria in CNS
Ependismal cells (4th type of neuroglia in CNS)
contain cilia that helps circulate CSF
PNS glial
Neuralemma cytes
Schwann Cells: forms myelin on nerves that are outside the brain and the spinal cord of CNS
PNS glial
Satellite cells
support cell bodies of the peripheral axons