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       (PATH "gifs/Syllabus Chapters/Spinal Cord/horns.compo.gif"))
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(FRAME-INFO (STRING "Spinal Cord Horns \(Gray Matter\). The gray matter illustrated here was traced from a set of human spinal cord sections. Note the increase in gray matter \(particularly in the anterior horns\) in the  cervical \(C5-T1\) and lumbar \(L2-S2\) regions. These enlargements accommodate additional neurons for processing the output \(and input\) required for the innervation of the upper and lower extremities respectively.  The thoracic cord innervates the trunk, and remains much the same size from segment to segment \(segments T7-T9  are not shown\)."))