( 401 ) 



lateralis humeri, crossing the spina scapulae 3 cm. below the acromion, 

 following on the dorsal surface of the fore-arm the furrow between radius 

 and ulna, and passing over the metacarpus of the little finger, between this 

 and the 4*'! finger to the plant. Next it crosses the latter in a cranial 

 direction, in such a manner that the plants of the fingers are insensible 

 with the exception of the 4"i and the 5*'^ circumscribes the plant of the 

 hand and crosses again the hand towards the radial side, goes upward 

 again, at first in the direction of the epicondylus humeri medialis, then taking 

 a bend in the direction of the plica axillaris ventralis, approaching this 

 very closely, and reaching the mid-ventral line, towards w^hich it is directed 

 perpendicularly, at the second rib. 



The caudal boundary-line starts from the back at the 10'^ vertebra, con- 

 tinuing perpendicularly on the longitudinal axis, crosses the spina scapulae 

 and continues parallel with the plica axillaris in a cranial direction until 

 very close to the cranial border. Between the two a very narrow sensible 

 area remains. It then takes a bend in caudal direction, reaching the mid- 

 ventral line at the third rib. 



To the left are two insensible spots. One of these is found opposite the 

 2'^d and S^'d rib at the mid-ventral line. The other, elliptic, is almo.st identical 

 with that found on dog IV. 



Fia-. V. 



9tii and lO^i^ root. 



Dog. V. 9 i> and 10"' root isolated to the rigid 



])y cutting through i, 5, 0, 7, 8, 11, 12, 13 and 14, 



to the left 10 has been cut through. 



Proceedings Roval Acad. Amsterdam. Vol VI. 



27 



