1897.] NEW YORK ACADEMY OF SCIENCES. 93 



nerve to the Subclaviiis muscle. This nerve is derived from the 

 cord formed by the Fifth and a large branch from the Fourth 

 Cervical nerves, and receives also a fine branch from the Sixth 

 nerve. At the point of accession of the latter branch the nerve 

 gives off a communicating filament to the Phrenic, which passes 

 inward across the Anterior Scalenus and Vertebral artery to 

 join the Phrenic at the upper margin of the first costal cartilege. 



Explanation of Figures. 

 Fig. I. 

 Plan of right cervical plexus of Macacus rhesus, 9 • 

 ( Xr. Spinal accessory nerve. 

 XII. Hypoglossal nerve. 

 C. I. Anterior division First Cervical nerve. 

 C. II. Anterior division Second Cervical nerve. 

 C. III. Anterior division Third Cervical nerve. 

 C. IV. Anterior division Fourth Cervical nerve. 



1. Communicating branch of C. I. to XII. 



2. Centrally directed bundle of same, running in sheath of XII. 



3. Distally directed bundle of same, running in sheath of XII. and con- 

 tributing to the formation of the deep cervical ansa. 



4. Branch from C. I. and C. II. to XI. 



5. Branch from C. III. to XI. 



6. Branch from C. II. to vagus. 



7. Branch from C. II. to Kect. cap. ant. major. 



8. Ansa cervical is profunda. 



9. N. Auricularis magnus. 



10. N. Cervicalis superficialis, upper branch. 



10. N. Cervicalis superficialis, lower branch. 



11. 11, 11. Branches of C. III. to deep prajvertebral muscles and Levator 

 anguli scapulae. 



12. Branch from C. IV. to Scalenus anticus. 

 P. Branch from C. IV. to Phrenic nerve. 



13. Branch from C. IV. to Levator claviculse. 



14. Nn. Supra-acromiales. 



15. Nn. Supra-claviculares and Supra-sternales. 



Fig. II. 

 Communication of Spinal Accessory and Third Cervical nerve in SIncacus 

 plleatus. 



XL Spinal Accessory nerve. 



C. III. Anterior division of Third Cervical nerve. 



1. N. Auricularis magnus. 



3, 3'. N. Cervicalis superficialis. 



2. Communicating branch from C. III. to XL 



7, 8, 10. Ascending division of N. Cervicalis superficialis. 

 9. Infra-maxillary branches of N. Facialis. 



11. Transverse division of N. cerviculis superficialis. 



12. Superior branch of transverse division of N. Cervicalis superficialis. 



13. Inferior branch of transverse division of N. Cervicalis superficialis. 



Fig. III. 

 Superficial dissection of right side of neck of Macums pileatus. 



