CEREBRAL NERVES 



165 



The seventh or facial nerve (Figs. 49 and 53, VII} arises 

 just behind the fifth and soon joins the Gasserian ganglion. 

 Both it and the sixth leave the skull by the same aperture 



N 



FIG. 53. Dissection of the head and anterior part of the body of the frog from the 

 left side, to show the distribution of the fifth, seventh, ninth, and tenth cerebral 

 nerves, as well as of the hypoglossal and part of the sympathetic. 

 Ao. systemic arch ; br.pl. brachial plexus; co. columella ; D. Ao. dorsal aorta; 

 ctu. duodenum ; H. heart ; Hy. body of hyoid ; Hy*-. anterior, and Hy*. posterior 

 horns of hyoid ; L. lung ; N. olfactory sac ; On. orbit ; Pul. pulmonary artery ; 

 Sp. A. splanchnic artery; s^. stomach ; Sy. sympathetic; //. cut end of optic 

 nerve ; K 1 . ophthalmic, I 72 , maxillary, and V&. mandibular branch of trigeminal 

 (V)\ VII^. palatine, and Vlfi. hyomandibular branch of facial; IX. glosso- 

 pharyngeal ; X. vagus ; Xcd. cardiac, Xgas. gastric, Xlar. laryngeal, and 

 Xpul. pulmonary branch of vagus ; / sp. first spinal nerve (hypoglossal) ; 

 2sp.5sp. second to fifth spinal nerves. (After Howes, slightly modified.) 



as the fifth. It divides into two branches, one of which, 

 ti\e palatine (Fig. 53, F// ] ), supplies the mucous membrane 

 of the roof of the mouth, and the other, or hyomandibular 

 (F// 2 ), sends branches to the skin and muscles of the 



