CARNIVORA. 523 



OMNIVORA. 



In the hog the cerebral convolutions are still fewer than in the ruminant, 

 but beyond this fact, the brain presents no important comparative features. 

 The siqyerior maxillary division of the fifth nerve pursues a remarkably short 

 course in the orbital fossa. The imeumogastric nerve unites in the cervical 

 region with the sympathetic ; its cesophageal portions differ chiefly in the 

 superior branch being very much larger than the inferior. 



The nerves of the brachial plexus present few deviations from the type, with 

 the exception of the median and cuhital nerves. The former of these, below 

 the carpus, supplies the interosseous palmar muscles, and afterwards divides 

 into four branches, one for each of the four digits ; those supplying the large 

 digits reach the central interdigital space. The cubital nerve bifurcates near 

 the trapezium, one branch running down the flexor tendons externally, to 

 supply the outer digit, the other gains the anterior aspect of the metacarpus, 

 and furnishes the dorsal nerves of the external digits. 



In the lumbo-sacral plexus we note that the musculo-cutaneous nerve on 

 reaching the metatarsus trifurcates, thus forming the dorsal nerves of the 

 digits. The anterior tibial nerve passes down between the large metatarsal 

 bones, and communicates with the plantar nerves, the external of which 

 supplies the outer and partly the inner digits, the internal nerve being small. 



CARNIVORA. 



In the brain of carnivora the nates are smaller than the testes, and the 

 olivary bodies well marked. The olfactory lobes are exceedingly well deve- 

 loped, the sense of smell attaining, perhaps, its maximum of acuteness in these 

 animals. The fourth ventricle is large and deep. 



A branch of the seventh nerve accompanies the duct of Steno to the facial 

 region. The pneumogastric and sympathetic trunks are inseparably united 

 in the cervical region. The recurrent nerves arise by two branches which 

 supply sparingly the trachea and oesophagus, these organs being also supplied 

 by the tracheo-oisoijhageal branch of the superior laryngeal nerve. The 

 cesophageal plexus of the pneumogastric is better marked than in the horse. 

 The bronchial nerves are numerous and large. 



In the dog, the nerves of the brachial plexus as far as the carpal region 

 resemble in the main those of the horse. The dorsal nerves of the digits are 

 supplied by a cutaneous branch of the radial nerve. The median nerve is 

 attached superiorly to the cubitah Inferiorly it inclines to the inner aspect of 

 the limb, and below the carpus it divides into six branches, one of which 

 crosses over to unite with a branch of the cubital, and form the superficial 

 palmar arch. The remaining palmar branches supply all the digits excepting 

 the fourth and part of the third. The cubital nerve divides into a dorsal and 

 a palmar branch ; the first running down the forearm and carpus externally 

 to supply the fourth digit ; the latter divides into eight branches, which, 

 deep-seated, supply all the digits excepting part of the index or first, a branch 

 passing across to the pollex, and forming what may be regarded as a deep 

 palmar arch. 



