Differentiating levels of the cord of ventral horn

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Unformatted text preview: enlarged ventral horns in two places: the lower cervical sections (C5cervical C8) and the C8) lumbar/sacral sections. Differentiating Levels of the Cord of Proportion of white matter to Proportion gray matter gray The amount of white matter of relative to grey matter decreases to grey decreases as you move down the cord. in the white matter of the cervical cord you have all of the axons going to or from the entire body. In sacral cord the white matter contains only those axons going to or from the last couple of dermatomes - all all other axons have "gotten off" at higher levels. wide flat cord, lots of white matter, ventral horn enlargements = cervical. Round cord, ventral horn enlargements = lumbar. Small round cord, almost no white matter = sacral. the intermediate horn, or the intermediolateral cell intermediolateral cell column. It is the source of all of the sympathetics iin the body, sympathetics n and occurs only in thoracic sections. Spinal Cord Tracts Spinal Divided into colunms (funiculi) containing colunms containing tracts tracts Ascending tracts relay info from spinal cord to brain (sensory) brain Descending tracts relay info from brain to cord (motor) cord Sensory (Acending) Tracts Sensory Fibers carry signals for vibration, visceral pain, deep and discriminative touch (touch whose location one can precisely identify) and especially proprioception proprioception (nonvisual sense of the position sense and movement of the body) and Sensory (Acending) Tracts Sensory Since the tracts are on the dorsal side of the cord, they are the sometimes called the dorsal columns or posterior columns. columns the posterior columns can posterior actually be divided into two separate tracts. tracts. The midline tracts are tall and thin, and are given the name gracile fasciculus grac (gracile means slender, and means and fasciculus means a fa means collection of axons). The outer tracts are more wedge shaped, and were given the name cuneate cuneate fasciculus (cuneate means means wedge-shaped). wedge shaped). Spinal Cord Tracts...
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This note was uploaded on 12/08/2011 for the course AMY 2A taught by Professor Jamesivey during the Spring '06 term at Riverside Community College.

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