Spinal Cord Enclosed within the vertebral column Contiguous with and extends from the medulla oblongata at the foramen magnum to 1 st lumbar vertebra Provides two-way communication to and from the brain Protected by vertebrae, meninges, and CSF Epidural space between vertebrae and dura mater filled with fat and blood vessels
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Spinal Cord Enclosed within the vertebral column Contiguous with and extends from the medulla oblongata at the foramen magnum to 1 st lumbar vertebra.
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Spinal Cord
Enclosed within the vertebral column Contiguous with and extends from the medulla
oblongata at the foramen magnum to 1st lumbar vertebra
Provides two-way communication to and from the brain
Protected by vertebrae, meninges, and CSF Epidural space between vertebrae and dura mater
filled with fat and blood vessels
Dorsal roots
Dorsal rootVentral
root
Conus medullaris
Filum terminale
Cauda equina
Spinal Cord
Embryonic Development of the Spinal Cord
Figure 12.27
Cross-Sectional Anatomy of the Spinal Cord
Gray matter located centrally, white matter peripherally Dorsal roots – entry point of sensory neuron axons Ventral roots – exit point of motor neuron axons
Dorsal half – sensory roots and ganglia Ventral half – motor roots Dorsal and ventral roots fuse laterally to form spinal nerves Four zones are evident within the gray matter – somatic
sensory (SS), visceral sensory (VS), visceral motor (VM), and somatic motor (SM)