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RIGHT EYE (CN III, IV, VI)
CN V—SENSORY

Trapezius muscle

Trapezius muscle

CN XI—MOTOR

5 sacral, and 1 coccygeal. Each nerve has an anterior (ventral) root containing motor fibers, and a posterior (dorsal) root containing sensory fibers. The anterior and posterior roots merge to form a short (<5 mm) spinal nerve. Spinal nerve fibers commingle with similar fibers from other levels to form peripheral nerves. Most peripheral nerves contain both sensory (afferent) and motor (efferent) fibers.

Like the brain, the spinal cord contains both gray matter and white matter. Nuclei of gray matter, which are aggregations of nerve cell bodies, are surrounded by white tracts of nerve fibers connecting the brain to the peripheral nervous system. Note the butterfly appearance of the gray matter nuclei, with anterior and posterior horns.

Posterior horn

Posterior root Posterior root

Posterior horn

Posterior root Posterior root

THE SPINAL CORD, CROSS SECTION
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