Nervous System II

Nervous System II - Spinal Cord Spinal Cord Regions of the...

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Spinal Cord
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Spinal Cord Regions of the Spinal Cord Cervical Thoracic Lumbar Spinal Nerves Leave the Spinal Cord in Cervical region Thoracic region Lumbar region Sacral region
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Spinal Cord (continued) Conus Medullaris: terminal end of the spinal cord that occurs at ~L1 to L2 Cauda Equina: group of nerve roots that come off the conus medullaris Filum terminale: fibrous extension of the pia mater that anchors the spinal cord to the coccyx Cervical and lumbar enlargements: region where nerves emerge that serve the upper and lower limbs
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Spinal Cord Figure 12.28a
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Cross-Sectional Anatomy of the Spinal  Cord Figure 12.30a
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Cross Sectional Anatomy of the Spinal  Cord Gray commissure: surrounds central canal and connects groups of gray matter Posterior (dorsal) horns: contains interneurons Anterior (ventral) horns: contains interneurons and somatic motor neurons Lateral horns: contain sympathetic nerve fibers
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Gray Matter and Spinal Roots Figure 12.30b
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Spinal Cord Gray Matter Cell bodies (Soma) for somatosensory neurons are located in the dorsal root ganglia Cell bodies (Soma) for motor neurons that control skeletal muscle movement are located in the ventral horn Visceral Sensory and Visceral Motor regions (for internal organs) are located toward the center of the gray matter
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Gray Matter: Organization Figure 12.31
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Nervous System II - Spinal Cord Spinal Cord Regions of the...

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