304 H. W. NORRIS 
Nervus facialis (Urodela) 
Portio dorsalis: 
Radix lineae lateralis 
Ganglion lineae lateralis dorsale 
Rami: 
Truncus supraorbitalis 
Ramus ophthalmicus superficialis 
Ramus oticus(?), cum r. otico V 
Truncus infraorbitalis 
Ramus buecalis, cum r. maxillari V 
Portio ventralis: 
Radix communis (fase. communis) 
Radix motor 
(Radix spinalis, Siren) 
Ganglion geniculi 
Ganglion lineae lateralis ventrale 
(Ganglion spinale, Siren) 
Rami: 
Truncus hyomandibularis 
Ramus mentalis 
Ramus mentalis externus 
Ramus mentalis internus 
Rami postorbitales 
Ramus jugularis 
Ramus alveolaris (cum r. palatino, Siren) 
Ramus palatinus 
Ramulus palatinus caudalis 
THE GLOSSOPHARYNGEAL AND VAGUS NERVES 
1. The roots of the IX—X complex 
Four groups of rootlets may be recognized in the [IX—X complex 
of the Urodela: (1) lateral line fibers of the vagus; (2) communis 
and motor fibers constituting the glossopharyngeus root; (3) a 
group of communis, general cutaneous and visceral motor fibers 
forming the vagus proper; (4) motor fibers arising by a variable 
number of rootlets, but which may be traced posteriorly as a 
compact tract of coarse fibers in the lateral columns of the medulla 
oblongata passing into the spinal cord. This may be termed a 
motor accessory tract. 
The first of these groups in Siren (X ril.) enters the brain in 
the usual manner, by two rootlets (figs. 42-44). On examination 
