Rehabilitation Sciences 3062A/B Lecture 2: Lecture 2
12 May 2017
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Lecture 2: spinal cord, peripheral nervous system, autonomic nervous system. Functions: conduit function (ascending & descending tracts, intrinsic function (eg. reflexes) Butterfly-shaped or (h-shaped) central gray matter surrounded by ascending and descending white matter columns. Dorsal horn: sensory, afferent fibers enter through the dorsal horn. Ventral horn: motor, lower motor neurons project out to the muscles with that segment. How to tell different levels of the sc. The absolute amount of white matter increases at each successively higher spinal segment a lot more white compared to gray matter when you hit upper cervical spine: most sensory fibers haven"t left yet (upper cervical spine) The lateral horn is present from t1-l2. Fasciculi cuneatus and gracilis are both present above t7. Extends from foramen magnum to l1-l2 vertebrae. In each segment, there are pairs of nerve roots: define specific distribution to sensation as well as motor function. They are located in the same quarter, but there is only one dura.
