Diseases of the nervous system .. . FiG. 153.—Diagram. (After Seiffer.) THE SEAT, EXTENSION AND COMPOSITION 357 ing downward the lines between the individual segments we can plainly seewhich spinal cord segments supply the individual muscles. The relation of cutaneous innervation to isolated spinal cord segments is. Fig. 154.—Diagram. (After Seiffer.) 358 NEOPLASMS OF THE SPINAL CORD AND OF ITS MEMBRANES also clearly shown; in former diagrams the individual cutaneous areas werenot sharply defined, this heing impracticable because of the innervation ofindividual cutaneous areas by several diffe
Diseases of the nervous system .. . FiG. 153.—Diagram. (After Seiffer.) THE SEAT, EXTENSION AND COMPOSITION 357 ing downward the lines between the individual segments we can plainly seewhich spinal cord segments supply the individual muscles. The relation of cutaneous innervation to isolated spinal cord segments is. Fig. 154.—Diagram. (After Seiffer.) 358 NEOPLASMS OF THE SPINAL CORD AND OF ITS MEMBRANES also clearly shown; in former diagrams the individual cutaneous areas werenot sharply defined, this heing impracticable because of the innervation ofindividual cutaneous areas by several different segments, and only the direc-tion of the innervation wasindicated by lines. Butat either side of theselines lies the cutaneous,area which is supplied~bya definite spinal cord seg-ment. At the same timeit becomes evident, as Ed-inger explains, that theotherwise obscure distribu-tion of cutaneous innerva-tion in the extremitiesdoes not actually repre-sent the case, because thediagram is based on em-bryology (Figs. 150 and151). However, we mayalso utilize the diagramsof other authors. For thesake of the findings Ihave included those ofSeiffer, as well as thoseof Head; the diagram ofthe latter author has en-abled me exactly to localizemany spinal cord tumors—at least their upper boun-daries (Figs. 152,
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