154 Journal of Comparative Neurology. 



Ill, — The Communis System 206 



IV. — The Motor Components 221 



V. — Summary of Section 3 222 



Section 4. — The Spinal Nerves 223 



I.— The Fourth Spinal Nerve 223 



II.— The Third Spinal Nerve 225 



III.— The Second Spinal Nerve 226 



I v.— The First Spinal Nerve 228 



V. — Comparative Reviev? of the First Spinal Nerve 234 



VI. — Summary of the Spinal Nerves 239 



Section 5. — The Nerves of the Vagus Group 241 



I, — The Roots and Ganglia of the Vagus Group 242 



I. — The Communis Root of the N. Glossopharyngeus . . 242 



2. — The Communis Root of the Vagus 244 



3. — The Cutaneous Root of the Vagus 246 



4. — The Motor Roots of the Vagus and Glosso- 

 pharyngeus 247 



/. — The Nucleus Ambiguus 247 



n. — The Motor Vagus 249 



in. — The Motor Glossopharyngeus 250 



iv. — General Considerations 251 



5. — The Root of the R. Lateralis Vagi 254 



II. — The N. Glossopharyngeus 255 



III. — First Truncus Branchialis Vagi 257 



IV. — Second Truncus Branchialis Vagi 259 



V. — Third Truncus Branchialis Vagi 260 



VI. — Fourth Truncus Branchialis Vagi 261 



VII. — Other Visceral Rami of the Vagus 262 



I. — Ramus Intestinalis 262 



2. — Oesophageal Rami 262 



3. — Ramus Cardiacus 263 



4. — Pharyngeal Rami 263 



5. — Branchio-motor Rami 263 



/.—Ramus for M. Transversus Dorsalis 263 



ii. — Ramus for M. Retractor Arcus Branchii Dor- 

 salis . 263 



Hi. — Ramus for M. Pharyngeus Transversus 264 



iv. — Ramus for M. Pharyngo-clavicularis Internus, 264 

 V. — Ramus for M. Pharyngo-clavicularis Ex- 



ternus 264 



VIII. — Rami Cutanei Dorsales Vagi 267 



IX. — Ramus for M. Trapezius (Accessorius) 273 



