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A&P II
Slides 8 and 9 Brain and Cranial Nerves
17
Anatomy
Undergraduate 3
01/16/2013

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Term
Central Nervous System (CNS)
Definition
Brain and spinal cord
Term
Peripheral Nervous system (PNS)
Definition
All neural structures outside the brain and spinal cord
Term
Association neuron (interneuron)
Definition
Multipolar neurons located entirely in the CNS
Term
Sensory neuron (afferent neuron)
Definition
Neuron that transmits impulses from a sensory receptor into the CNS
Term
Motor neuron (efferent neuron)
Definition
Neuron that transmits impulses from the CNS to an effector muscle
Term
Afferent
Definition
bringing to or leading toward an organ or part
Term
Efferent
Definition
conveying or conducting away from an organ or part
Term
Somatic motor neuron
Definition
Neuron that stimulates contraction of skeletal muscles (voluntary muscles)
Term
Autonomic motor neuron
Definition
Neuron that stimulates (or inhibits) contraction of involuntary muscles (smooth muscles + cardiac muscle)
Term
Nerve
Definition
Cable-like collection of many axons in the PNS
Term
Tract
Definition
Grouping of nerve axons that interconnect regions of the CNS
Term
Plexus
Definition
an interlacing network of nerves serving a particular anatomical area (brachial plexus, for example)

a structure in the form of interlaced parts, especially of nerves, blood vessels, or lymphatics
Term
Ganglion
Definition
Grouping of neuron cell bodies located outside the CNS
Term
Nucleus
Definition
Grouping of neuron cell bodies within the CNS
Term
Gyrus
Definition
A ridge on the surface cerebral cortex.
Term
Sulcus
Definition
A groove in the surface cerebral cortex.
Term
Fissure
Definition
A deep sulcus
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