12-1 Nervous System Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Brain Nerves Ganglia Peripheral nervous.

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12-1 Nervous System Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Brain Nerves Ganglia Peripheral nervous system (PNS) Central nervous system (CNS) Spinal cord Figure 12.1

13-2 Cross-Sectional Anatomy of the Spinal Cord Ventral median fissure Gray commissure Central canal Dorsal median sulcus (c) Lumbar spinal cord c: Sarah Werning

Spinal Cord gray matterwhite matter 13-3

13-4 Cross-Sectional Anatomy of the Spinal Cord White matter: Lateral column Ventral column Dorsal column (c) Lumbar spinal cord c: Sarah Werning

13-5 Cross-Sectional Anatomy of the Spinal Cord Gray matter: Dorsal horn Dorsal root ganglion Spinal nerve Lateral horn Ventral horn Dorsal root of spinal nerve Ventral root of spinal nerve (c) Lumbar spinal cord c: Sarah Werning

Spinal Nerve dorsal root dorsal root gangion ventral root spinal nerve 13-6

31 Pair of Spinal Nerves 13-7

dorsal ramusventral ramus rami 13-8