THE NERVES. 157 



branches, are distributed to the muscles of the eye for motion 

 only. 



The pathetici, or fourth pair {Plate V. Fig 1.4), are 

 nerves which take their origin near to the junction of the 

 cerebrum with the cerebellum : they are chiefly sent to 

 the superior obhque muscles of the eyes ; and are called the 

 pathetic, from their supposed power of turning the eyes 

 upwards ; which these muscles cannot do. They are the 

 smallest of all the nerves of the brain. 



The pars trigemini, ov fifth pair {Plate V. Fig 1.5), are 

 large and very important nerves ; having extensive com- 

 munications. They escape by numerous filamentary twigs 

 from the pons varoli ; and pass over a ganglion immediately 

 afterwards. The sentient fibres travel over the top of the 

 ganglion ; and the motor filaments pass beneath it. Having 

 done this they unite as a compound nerve having both 

 feeling and motion ; and in one large cord, speedily sepa- 

 rate, forming three principal branches. First, the ophthal- 

 mic ; which divides into the supra-orhitar ; the lachrymal ; 

 and a lateral nasal branch ; whose destinations we need 

 not follow, seeing their names already signify them. The 

 second, or anterior maxillary branch ; which is the largest 

 of the three divisions of the nerve, proceeds to the face by 

 the infra-orbital foramen ; where it gives off branches ; first 

 parting with a twig to the inner canthus of the eye ; another 

 along the tuberosity of the upper jaw bone ; and two or 

 three more which ramify within the palate ; posterior parts 

 of the mouth ; and among the upper teeth. — The larger 

 division, communicating wdth the portio dura, proceeds in 

 a straight course ; and divides into small and numerous 

 branches upon the upper lip. The third division of the 

 pars trigemini is the posterior maxillary, or the nerve of 

 mastication. It sends ofl' pterygoid branches as soon as it 

 emerges from the cranium ; after this it gives the gustatory 

 for taste to the tongue (a nerve of special sense) ; numerous 

 twigs to the throat ; after which it parts with a buccal 

 nerve to the membrane of the mouth ; and then enters the 

 posterior foramen of the lower jaw, distributing a dental 

 nerve to the lower teeth ; and a medullary nerve to the 

 bone itself; going to the under lip, when it comes forth 

 upon the outer side of the jaw near the symphysis. Of the 



