130 MAMMALIA. 



of which it coalesces. In the porpoise, the third trunk gives off a large branch, the 

 mylo-hyoideal, to the muscles corresponding with the mylo-hyoideal and the inferior 

 belly of the digastric; it also gives off the gustatory, which sends one branch to 

 communicate with a branch of the ninth, and then passes in small filaments to the 

 surface of the tongue ; two other large branches of the gustatory supply the membrane 

 between the jaw and side of the tongue ; it sends the inferior dental into the lower jaw 

 to supply the teeth, which then emerges at the mental foramen to supply the lower 

 lip ; it gives off the buccal to the parts about the angle of the mouth ; it gives branches 

 to the temporal, pterygoid, and masseter muscles. A small superficial temporal passes 

 to the skin near the auditory meatus, and communicates by a filament with the hard 

 portion. The branch of the gustatory sent to the tongue is not so large as usual in 

 mammalia, but the other portion given to the membrane at the side of the tongue is 

 larger. 



The inferior dental nerve, just before entering the lower jaw, gives off the mylo- 

 hyoideal nerve which descends, closely connected with the periosteum lining the inner 

 surface of the jaw, until it reaches the inferior belly of the digastric muscle. It is 

 larger in carnivorous than in herbivorous animals ; it supplies the inferior belly of the 

 digastric and the mylo-hyoideal muscle only in man and some animals, as the baboon, 

 pig, and sheep, whilst in the dog and fox, it sends branches to the face to join some 

 from the hard portion of the seventh, and others forward to the cutaneous muscle 

 underneath the jaw ; on the right side of the face of a dog, two branches joined the 

 hard portion, and on the left only one ; whilst a branch was given by the hard portion 

 to the inferior belly of the digastric muscle ; in the pig, it sends a branch outwards to 

 the salivary glands. The inferior dental nerve passes behind part of the internal 

 pterygoid, and then part of the insertion of the external ; it enters the lower jaw, and 

 gives branches to the teeth ; it usually emerges at a single foramen near the chin, 

 when it immediately divides into two or three branches ; some of which communicate 

 with filaments of the hard portion, and all of them, after ramifying, terminate on the 

 muscles and skin of the lower lip. In the baboon, it sends branches through several 

 foramina. In the pig, from near the angle of the mouth, it begins to send out four 



