VISCERAL RAMI OF THE VAGUS. 107 



which are supplied by these nerves are all or nearly all 

 striated. In the plots I have not distinguished these fine 

 viscero-motor fibres from the sensory fibres which they 

 accompany because of the impossibility of analyzing them 

 here or of tracing them to their nucleus of origin. In 

 Fig. 4. the oesophageal and infra-pharyngeal rami have 

 been slightly schematized; really they consist of several 

 trunks with an elaborate plexiform anastomosis. 



J. — Ramus Cardiacus. 



As the oesophageal fibres curve ventrally around the 

 oesophagus, a small bundle separates and accompanies 

 the adjacent precaval vein to the heart {r. car.) This is 

 the cardiac nerve. Its fibres are partly very fine and 

 partly of medium size and heavily medullated. 



/J.. — Pharyngeal Rami. 



Of the sensory fibres, a small twig supplies the most 

 caudal superior pharyngeal teeth {pJi. d.), while several 

 considerably larger nerves enter the caudal edge of the 

 inferior pharyngeal bone for its teeth {p/i. v.) 



5. — Branchio-]\Iotor Rami. 



Besides the fibres above referred to, I enumerate with 

 this division the following coarse fibred motor nerves for 

 the branchial musculature. They can easily be traced 

 back to the common motor bundle of the vagus and so 

 with tolerable certainty to the nucleus ambiguus. As in- 

 dicated on Fig. 4, the following motor nerves are given off: 



i. — Ramus for in. transversus dorsalis [m. tr. d.) — 

 This muscle runs from side to side between the two 

 superior pharyngeal bones. 



ii. — Ramus for m. retractor arcus brancJiii dorsalis 

 (;«. r. <:/.), a muscle which runs from the second and third 



