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The Nervous System
Terms in this set (27)
Smooth or Stellate is called_____
Cell Body (soma)
The____carries impulses towards the cell body
Description: Short, highly branched extensions of cell body.
______carries impulses away from the cell body insulated by neuroglia
Description: long, slender extension of cell body.
When joined to a dendrite of another neuron =
When joined at a muscle cell=
Wrapped around peripheral neurons provide support and axons insulation (myelination) improve speed of nerve impulse conduction
Gaps between Schwann cells serve as relay points for nerve impulses.
Nodes of Ranvier
Wrapped around central neurons provide myelination similar to Schwann cells
Crowded among central neurons, support and link neurons to blood capillaries regulate diffusion; contributed to blood-brain barrier
_____are impulses that travel towards the brain, from from sensory receptors in skin and organs.
______are impulses that travel away from the brain, into effectors (muscle/glands)
_______transmit impulses between neurons in central nervous system; help in analysis of sensory input and coordination of motor output
Multiple (short) dendrites; one (long) axon usually motor in function
One process splits near cell body usually sensory in function.
Groups of mixed nerves located peripherally (outside the central nervous system) are called......
Outermost, dense irregular connective tissue provides strength and allows for some stretch is called .....
Dense irregular connective tissue sheaths surrounds neurons of similar origins or destination forms and exposes axons into "fasciculi" is referred to as.......
......are loose connective tissue between single nerve fibers
......is outside fasciculi within epineurium veins and arteries-outside and throughout fasciculi
___ are junctions that facilitate (or inhibits) the transmission of electric signals between neurons
____reacts to arriving impulses
Contain/release neurotransmitters refers to_____
______are narrow gap between nerve cells
Reacts (+/-) to neurotransmitters is referred to as_____
Presynaptic impulses —> rupture of synaptic vesicles —> release of neurotransmitter —> new, postsynaptic impulses(s) is called______
Sequence of Events in Impulses Transmission
Organization of the Nervous System
2. Spinal Cord
A. Central Nervous System (CNS)
Nerve tissue within within cranial and spinal cavities
1. Afferent (sensory) Division
2. Efferent (motor) Division
a. Somatic N.S.- serves skeletal muscle
b. Autonomic N.S.- serves heart and smooth muscle
Peripheral Nervous System (PNS)
Nerve bundles leading to/from the brain and spinal cord
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