THE SPINAL NERVES. 



181 





these glands. This description, founded upon that of Lenhossek, 

 can be confirmed by the translator in every particular ; his sections, 

 however, would lead him to believe that the glands are far more 

 vascular than the description and the drawings of Lenhossek 

 imply.] 



d. The Branches of the complete spinal nerves formed by the 

 union of the dorsal and ventral roots with the ganglion (Fig. 120) 

 are usually described as two, a dorsal and a ventral branch, which 

 latter at once gives off a Raiim* communicant to the sympathetic 

 system ; these two branches are given off almost immediately 

 beyond the ganglion. 



II. The Individual Nerves. 



A. The Dorsal Branches (Fig. 121). 



The dorsal branches are smaller than the ventral; they pass up- 

 wards between the inner borders of the Mnsc. intertransrersarii and 

 the articular processes of the vertebrae to reach the under surface 

 of the 31. longittimtu doni; the general course of these nerves is 

 very similar for all ; each nerve gives off 



A twig to the 3ln#c. infertra/ix- 

 and then divides into two 

 branches. 



Fig. 121. 



(b] A Rani it* Muscjrfaris (Fig. 121 

 rm}, which passes outwards to supply 

 the 31. I OH gisx inn'* <lorxi, . 



(c] A Ramm cidanevs (Fig. 121 re]; 

 this nerve continues under the ex- ] 

 tensor muscle of the back, running 1 



9 O 



on the arch of the vertebra towards 

 the middle line; it then pierces the 

 muscle and Fascia dorsalis to reach 

 the large dorsal lymph-sac (Sacc. 

 cranio - dor sails), through which it 

 courses to end in the skin. In its 

 course through the sac the nerve is 



L j _-jj 11 i Dorsal branches of the spinal nerves. The 



connected with a small artery and faKta down, is dissected, removed 

 vein> by a small amount of connec- from the left side - 



I-,- ,i 111- 11 fc Rami cutonei. 



tive-tissue, the whole being enclosed ,., Kami niusclUai . os . 



