238 R. L. KITCHELL 



branches of this nerve can be traced to the oral mucosa of the medial sur- 

 face of the mandible caudal to the incisor and canine teeth. It also sup- 

 plies the subungual salivary gland and the oral mucosa ventral to the 

 tongue. In horses and cattle anastomoses between the sublingual and 

 lingual branches have been observed (Engebretsen and Kitchell, un- 

 published). 



COW 



Fig. 3. Gross dissection left mandibular and left lingual nerves in the cow. 

 For legend see Fig. 1. 



The microscopic aiaatomy of the chorda tympani nerves from various 

 domestic animals has also been of interest to us. Immediately after the 

 exsanguination of an anesthetized animal the chorda tympani nerve was 

 dissected free from the surrounding tissue. The middle one-third of the 

 nerve was stretched gently across a rectangular orifice in a small piece of 

 cardboard. The ends of the nerve were made to adhere to the card- 

 board by gentle pressure. This procedure resulted in a mild degree of 

 longitudinal tension on the nerve during fixation in Flemming's solution 

 (1 per cent chronic acid 15 ml, 2 per cent osmic acid 4 ml and glacial acetic 

 acid 1 drop) for 24 hr. The nerves were dehydrated in dioxane, embedded 



