THE MEDULLA OBLONGATA. 



365 



arise below as far as the sixth cervical nerve, and above as far as the be- 

 ginning of the oblongata, do not arise in exact order, as might appear from 

 Fig. 230, but extend first toward the brain, and later they bend outward 

 forming a knee (Darkschewitsch). Only the horizontal limb of this knee 

 has been caught in this section, represented in Fig. 230. 



The most anterior fibers of the acoessorius in animals, and in one ease observed 

 in maUj contain tlie inhibitory fibers to the heart. I have seen pronounced slowing 

 of the pulse on defecation arise from the existence of a, varix in the frontal ac- 

 cessorius region, and I saw this patient die with symptoms of increasing slowing of 



Fig. 232. — Cross-section of the oblongata in the region of the lowest hypo- 

 glossal roots. The pyramidal decussation nearly complete. No, Nucleus funiculi 

 cuneati. XII, Nervus hypoglossus. Other marks same as in Fig. 231. (After 

 Henle.) 



the heart's action, when the varix became larger and finally burst. {Berliner klinische 

 Wochenschrift, 1898.) 



Notice also, that in the space between the anterior and posterior horns 

 the gray matter passes through the lateral column in the form of a com- 

 plicated net-work; this is the formation of the processus reticulares. 



Their gray matter consists almost exclusively of commissural cells. 



