Chap 8: Nervous System WS Flashcards
Consists of the brain and spinal cord
CNS
Transmits action potentials from sensory organs to CNS.
Afferent Division
Nerves and ganglia outside the CNS
PNS
Subdivision of the efferent division that transmits action
potentials from the CNS to skeletal muscle only
Somatic motor nervous system
Subdivision of the efferent division that transmits action
potentials to smooth muscle, cardiac muscle, or glands; includes sympathetic and parasympathetic divisions
Autonomic nervous system
Location of the nucleus and source of information for protein
synthesis.
Cell body
Usually receives information and transmits it to the cell body
Dendrite
Areas of rough endoplasmic reticulum concentration in the cell
body
Nissl bodies
Branch of an axon
Collateral axon
Insulating layer of cells around an axon
Myelin sheath
Long cell process from the cell body; conducts action potentials
Axon
Neuron with several dendrites and one axon; most efferent
neurons
Multipolar
Neuron with one dendrite and one axon; found in the eye and
nose
Bipolar
Neuron with single process that functions as an axon and a
dendrite; most afferent neurons.
Unipolar
Produce and circulate cerebrospinal fluid in the CNS.
Ependymal cells
Participate with blood vessel endothelium to form a
permeability barrier in the CNS between blood and nerve cells
Astrocytes
Form myelin sheaths around axons in the PNS
Schwann cells
Form myelin sheaths around axons in the CNS
Oligodendrocytes