PNS-outline(1) - Spine and Spinal Nerves; ANS page 1 of 3...

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Spine and Spinal Nerves; ANS page 1 of 3 ANAT 11110 Lectures 31 & 32 Fall 2011 The Spinal Cord and Spinal Nerves The Autonomic Nervous System I. Spinal cord A. Gross anatomy of the spinal cord B. Organization of gray matter 1. Posterior gray horn: contains cell bodies of somatic and visceral sensory neurons 2. Anterior gray horn: contains cell bodies of somatic motor neurons 3. Lateral gray horn: contains cell bodies of visceral motor neurons C. Organization of white matter 1. White matter divided into three regions: anterior, posterior, and lateral columns (aka, funiculi) 2. Ascending tracts: carry sensory information to the brain 3. Descending tracts: carry motor commands out to the periphery 4. Fiber characteristics within a tract a. All fibers carry information in the same direction b. All fibers have similar diameter and degree of myelination; therefore, conduction speed is similar c. All fibers have similar place of origin d. Fibers may have different destinations D. Nerve roots:
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PNS-outline(1) - Spine and Spinal Nerves; ANS page 1 of 3...

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