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 



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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. sy&temic arch ; br.pl. brachial plexus ; D. Ao. dorsal aorta ; dn. duodenum ; 

 H. heart ; Hy. body of hyoid ; hy^. anterior, and //j^. posterior horns of hyoid ; 

 L. lung ; N. olfactory sac ; On. orbit ; Pul. pulmonary artery ; Sp. A. splanchnic 

 artery ; St. stomach ; Sy. sympathetic ; //. cut end of optic nerve ; V^. ophthal- 

 mic, F2. maxillary, and V^. mandibular branch of trigeminal ; VII'^. palatine, 

 and Vir^. hyomandibular branch of facial ; IX. glossopharyngeal ; X. vagus ; 

 Xcd. cardiac, Xgas. gastric, Xlar. laryngeal, and Xpnl. pulmonary branch of 

 vagus ; / sp. iirst spinal nerve (hypoglossal) ; 3 sp.—j sp. second to fifth spinal 

 nerves. (After Howes, slightly modified). 



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

 tho. palatme (Fig. 53, VII'^) suppHes the mucous membrane 

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

 ( F//2) sends a branch to the skin and muscles of the 



