THE NERVOUS SYSTEM OF THE PIG 845 
The lacrimal nerve resembles that of the horse, the frontal that of the ox. 
The naso-ciliary nerve is relatively large and sends numerous filaments to the ocular 
muscles. The maxillary nerve has a very short course in the pterygo-palatine 
fossa. The infraorbital nerve is large in correlation with the development of the 
snout, which receives numerous branches. The mandibular nerve emerges through 
the foramen lacerum anterius. The superficial temporal nerve is small; according 
to Moussu it furnishes the excito-secretory fibers to the upper part of the parotid 
gland, while those going to the lower part are derived from the mylo-hyoid nerve. 
The inferior buccal nerve passes downward and forward under cover of the 
parotid gland and accompanies the parotid duct, with which it turns around the 
lower border of the jaw in front of the masseter. 
The vagus bears a jugular ganglion and a ganglion nodosum; the latter occurs 
=-—- Ulnar nerve 
Median 
Radial nerve 
nerve 
(cutaneous 
branch) 
Ulnar nerve 
~~~" Dorsal branch 
(dorsal branch) —-- 
Anastomotic —~ 
branch 
>! 
in 
sary 
Fic. 673.—Nerves oF Distat Part or RicHt Fore- Fic. 674.—Nerves or Distat Part oF RicuT FoRE- 
LIMB OF Pic; DorsaL View (SCHEMATIC). LIMB OF Pic; VOLAR VIEW (SCHEMATIC). 
c, Dorsal common digital nerves; p, dorsal proper p, Volar proper digital nerves. 
digital nerves. 
at the point of origin of the anterior laryngeal nerve, and may be as large as a small 
pea. Proximal to this the vagus is easily divided into two strands, one of which is 
the accessory component. The cesophageal trunks form a posterior cesophageal 
plexus, as in man, from which two nerves issue. The ventral nerve is small and 
ramifies on the parietal surface of the stomach. The dorsal nerve is much larger; 
it gives branches to the stomach, crosses the lesser curvature of that organ, and 
joins the cceliac plexus. 
The hypoglossal nerve may present a small dorsal root, on which there is a 
minute hypoglossal ganglion. 
The spinal nerves number on each side eight in the cervical region, fourteen 
(commonly) in the thoracic, seven in the lumbar, and four in the sacral. Some 
of the special features of the nerves of the limbs are as follows: 
