THE SPINAL NERVES. 



181 



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

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

 however, would lead him to believe that the g-lands are far more 

 vascular than the description and the drawings of Lenhossék 

 imply.] 



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

 union of the dorsal and ventral roots with the g-ang-lion (Fig. 120) 

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

 latter at once gives off a Hamus communicans 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 Mhsc. intertransversarii and 

 the articular processes of the vertebrae to reach the under surface 

 of the M. longissinms dorsi ; the general course of these nerves is 

 very similar for all ; each nerve gives off — 



[a) A twig to the AIksc. infertram- 

 versariifs and then divides into two 

 branches. 



(^) A Bannis mmicnlaris (Fig. 121 

 rm), which passes outwards to supply 

 the M. longismmis dorsi. 



(c) A Bamns c/ffa/ietfs (Fig. 121 re); 

 this nerve continiies under the ex- 

 tensor muscle of the back, running 

 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 -dorsalis), through which it 

 courses to end in the skin. In its 

 course through the sac the nerve is 

 connected with a small artery and 

 vein by a small amount of coniiec- 

 tive-tissue, the whole being enclosed 



Fig. I 21. 





Dorsal branches of the spinal nerves. The 

 Fascia dorsalis is dissected, removed 

 from the left side. 



re Rami cutanei. 

 rm Kami musculares. 



