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25 Cards in this Set
- Front
- Back
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Ventral Root
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contains motor axons
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Dorsal Root
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contains sensory axons bringing information into the SC; enters SC via rootlets
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Dorsal root ganglion location
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`outside the spinal cord on the dorsal root
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Dorsal root ganglion
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contains cell bodies of sensory neurons
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Spinal nerve
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formed by the dorsal and ventral roots; a mix of sensory and motor neurons; located in the intervertebral foramen
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Once the spinal n leaves the intervertebral foramen it splits into...
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2 rami, marking the beginning of the peripheral nervous system; dorsal rami and ventral rami
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Dorsal rami
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innervate the paravertebral mm, posterior parts of the vertebrae, and overlying cutaneous areas; mixed nn.
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Ventral rami
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innervates muscular, skeletal, and cutaneous areas of the limbs and of the anterior and lateral trunk; mixed nn.
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A segment of the spinal cord is connected to...
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a specific region of the body by a pair of spinal nn
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Propriospinal
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axons that begin and end within the spinal cord
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Tract cells
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cells with long axons connecting the spinal cord with the brain
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What columns of white matter contain tract cells?
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Dorsal and lateral columns
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What white matter contain axons of UMN?
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Anterior and lateral
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Dorsal and lateral columns transmit
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sensory info upward to the brain
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Lateral and anterior white matter conveys
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info descending from the brain to interneurons and LMN
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Central part of the SC is called...
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Gray matter & is H-shaped
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Regions of the gray matter are called..
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Horns
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3 regions of the horn
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Dorsal, Lateral, Ventral
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Dorsal horn
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primarily sensory, containing endings of first-order sensory neurons, interneurons, and dendrites and somas of tract cells
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Lateral horn
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Present only in T1-L2 segments, contains cell bodies of preganglionic sympathetic neurons
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Preganglionic autonomic neurons are what type of neurons?
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Efferent
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Ventral horn
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primarily cell bodies of LMN whose axons exit the SC via the ventral root
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Rexed's Laminae
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Spinal gray matter classified into 10 histologic regions that are functionally specific
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Meninges
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Layers of connective tissue surrounding the spinal cord
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Layers of the meninges- SC-> outer layer
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pia, arachnoid, dura
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