ii Parasympathetic division calms body stimulates Shirley J

Ii parasympathetic division calms body stimulates

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ii. Parasympathetic division: calms body, stimulates digestion. 55 © 2011 Shirley J. Wright, Ph.D. Visce ral sens ory divisi on Visce ral sens ory divisi on Som atic sens ory divis ion Som atic sens ory divis ion Symp athetic divisio n Symp athetic divisio n Parasym pathetic division Parasym pathetic division Visce ral motor divisi on Visce ral motor divisi on Som atic mot or divis ion Som atic mot or divis ion Central nervous system Central nervous system Brai n Brai n Spi nal cor d Spi nal cor d Sens ory divisi on Sens ory divisi on Mot or divis ion Mot or divis ion Peripheral nervous system Peripheral nervous system
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Anatomy of the Spinal Cord The spinal cord is 42-45 cm long and located within the vertebral canal of vertebral column. Cranially, it is continuous with the brainstem and caudally it ends in the conus medullaris at the level of L1 or L2 vertebra. Thus, the spinal cord is shorter than the vertebral column. Below vertebra L2, the vertebral canal contains many nerve roots which together look like a horse’s tail and are called the cauda equina . A thin thread of connective tissue, the filum terminale links conus medullaris to coccyx. The spinal cord has two swellings: (1) cervical enlargement supplies nerves to upper limb, (2) lumbosacral enlargement supplies nerves to lower limb. Thirty-one pairs of spinal nerves exit the spinal cord. Search in Primal Pictures: ? embeddedcode=C28857 .The screen should show an image of the spinal cord. Choose layer 1, 2 or 3. Move the mouse over any region of the image for identification. Label the spinal cord segments in the image at left as well as the conus medullaris. Label the spinal nerves in the image at right: cervical , label as C1 to C8; thoracic , label as T1 toT12; lumbar , label as L1 to L5; sacral , label as S1 to S5, and the one pair of coccygeal spinal nerves , label as Co. 56 © 2011 Shirley J. Wright, Ph.D.
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Transverse-Sectional Anatomy of the Spinal Cord When viewed in a transverse section, the spinal cord is oval in shape. It has a lighter- appearing cortex called white matter and an “H-shaped” or “butterfly-shaped” central region called gray matter . Because white matter consists of myelin-rich processes of nerve cells, it appears white. Because gray matter has a high concentration of nerve cell bodies, it appears gray. Each arm of gray matter extending into white matter on the posterior/dorsal side is the posterior horn (dorsal horn) of the spinal cord. Each arm of the “H” that extends into white matter on the anterior/ventral side is the anterior horn (ventral horn) of the spinal cord. The lateral horn is located between the anterior and posterior horns. In the center of the gray matter is a small central canal which is continuous with the brain ventricles and contains cerebrospinal fluid (CSF).
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  • Spring '11
  • Masthay
  • Vertebra, Bones of the torso

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