CEANIAL NERVES OF CAECILIANS 



497 



sp.lv., 2v., etc., ventral rami of spinal 



nerves 

 sp.2r., 3r., etc., roots of spinal nerves 

 sp.2vc., Svc, etc., cutaneous ramuli of 



the ventral rami of spinal nerves 

 sp.2vm., Svm., etc., motor ramuli of the 



ventral rami of spinal nerves 

 sp.2vmsv., Svmsv., etc., motor ramuli of 



the ventral rami of spinal nerves, 



innervating the rectus subverte- 



bralis musculature 

 sp.2l.,3l., etc., lateral rami of spinal 



nerves 

 sp.Svcl., J^vcL, etc., lateral cutaneous 



ramuli of the ventral rami of spinal 



nerves 

 sy., sympathetic trunk 

 sy.V , origin of the sympathetic trunk 



from the Gasserian ganglion 

 sy.V II, origin of the sympathetic 



trunk from the geniculate ganglion 

 t., tentacle 

 th., thymus 



thr., glandula thyreoidea 

 tm., m. temporalis 



tmpro.. caput preorbitale of m. tem- 

 poralis 

 tr., trachea 



tr.b., 'tract b' of Kingsbury 

 trc, trabecular cartilage 

 vo., vomer 



v.l, 2, etc., vertebrae 

 /., n. olfactorius 

 Id., dorsal division of n. olf. 

 ■Iv., ventral division of n. olf. 

 //., n. opticus 

 III, n. oculomotorius 



IV., n. trochlearis 



V ., n. trigeminus 



Vd., 'dorsal V 



Vrmd-mx., root of the maxillo-man- 

 dibular division of the trigeminal 

 nerve 



Vrop., root of the ophthalmicus pro- 

 fundus division of the trigeminal 

 nerve 



VI, n. abducens 



VII, n. facialis 

 Vllr., radices facialis 



VI Ire, radix communis facialis 

 Vllrll., radix lineae lateralis facialis 

 Vllrm., radix motor facialis 



VIII, n. acusticus 



Villa., radix anterior of n. acusticus 

 VIIIp., radix posterior of n. acusticus 

 Vlllr., radices acustici 



IX, n. glossopharyngeus = n. bran- 

 chialis primus 



IX ph., r. pharyngeus IX 

 IXphl., r. pharyngeus lateralis IX 

 IXpst., r. posttrematicus IX 

 IXr., radix glossopharyngei 

 IX-X, common trunk of ninth and 

 tenth nerves 



X, n. vagus 

 Xlat., r. lateralis X 

 Xr., radices vagi 



X.l, n. branchialis secundus 



X.lph., r. pharyngeus of the second 



branchial nerve 

 X.lphp., posterior pharyngeal branch 



of the second branchial nerve 

 X.lpst., r. posttrematicus of the second 



branchial nerve 



THE OLFACTORY NERVE 



As noted above, Burckhardt considers the double condition 

 of the olfactorius in Ichthyophis as more apparent than real. 

 According to him (I.e., p. 392), each of the two parts of the ol- 

 factory nerve, dorsal and ventral, on entering the olfactory bulb, 

 sends bundles of fibers into the other, forming in a way a chiasma 

 between the two divisions. It is evident in Herpele, Dermophis, 



