THE VERTEBRAL COLUMN. 



483 



TRANSVERSE SPINAL LESIONS. 



In endeavoring to localize transverse lesions of the cord, such as result from 

 traumatism, tumors, etc., one must bear in mind that the spinal nerves originate frorn 

 segments in the cord some distance above where they make their exit from the spinal 



FIG. 486. Diagram of distribution of cutaneous nerves, based on figures of Hasse and of Cunningham. On 

 right side, areas supplied by indicated nerves are shown; on left side, points at which nerves pierce the deep fascia. 

 V 1 , V 2 , V 3 , divisions of fifth cranial nerve; GA, great auricular; GO, SO, greater and smaller occipital; SC, super- 

 ficial cervical; St, Cl, Ac, sternal, clavicular, and acromial branches of supraclavicular (Scl)', Ci, circumflex; 

 MS, musculospiral ; IH, intercostohumeral; L/C, 1C, lesser internal and internal cutaneous; EC, external 

 cutaneous; IH, iliohypogastric; //, ilio-inguinal; 7~ 12 , last thoracic; GC, genitocrural ; EC, external cutaneous; 

 MC, middle cutaneous; 1C internal cutaneous; P, pudic; SS, small sciatic; O, obturator; C, T, L, and S, cervical, 

 thoracic, lumbar, and spinal nerves. (Piersol.) 



foramina. Chipault (quoted by Starr) gives the following practical rule: "In the 

 cervical region add one to the number of the vertebra, and this will give the segment 

 opposite to it. In the upper dorsal region add two; from the sixth to the eleventh 



