1897.] NEW YORK ACADEMY OF SCIENCES. 83 



completely in suppl3'ing these muscular filaments, remaining as 

 a slender twig in the sheath of the H3'poglossal and entering the 

 anterior candyloid canal with the same. 



The remainder of the First Cervical nerve descends in front of 

 the transverse process of the atlas, forming, with the Second 

 Cervical nerve, the First, or Atlantal, Cervical ansa. 



Close to the point of union of this descending branch of the 

 First with the Second Cervical nerve, the latter gives off a branch 

 (Fig. I., 4), which passes backward, applies itself for a short 

 distance to a similar branch (Fig. I., 5), derived from the Third 

 Cervical nerve, and then joins the Spinal Accessory nerve, the 

 majorit}^ of its fibres turning upwards and passing centripetally 

 within the Accessor}- sheath. A small twig descends peripherally' 

 with the communicating branch from the Third Cervical (Fig. 

 I., 5). 



The remainder of the Second Cervical nerve passes down, as 

 Ansa Cervicalis II., and, after giving oflT a communicating 

 branch to the A^agus (Fig. I., 6), and a branch to the Rectus 

 capitis anticus major (Fig. I., 7), is continued into the trunk, 

 which, with a similar branch from the Third Cervical, forms the 

 Ansa cervicalis profunda (Communicans Noni) (Fig. I., 8). 



The Third Cervical nerve, besides contributing the above men- 

 tioned communicating branch (Fig. 1., 5) to the Spinal Acces- 

 sory, and a branch (Fig. I., 8) to the Infra-hyoid muscular dis- 

 tribution, gives off the Great Auricular nerve (Fig. I., 9), which 

 includes in part the fibres usuallj^ found in the human subject, 

 forming the Occipitalis minor. 



The remainder of the nerve gives off the upper branch of the 

 Superficial Cervical nerve (Fig. I., 10) and a laranch, which, to- 

 gether with a contribution from the Fourth Cervical nerve, forms 

 the lower division of the Superficial Cervical (Fig. I., 10'). 



It also supplies a number of branches to the deep prevertebral 

 muscles and to the Levator anguli scapuh^ (Fig. I., 11, H, H). 



The Fourth Cervical nerve gives the above mentioned branch to 

 the Superficial Cervical nerve. It also furnishes, near the point 

 of exit from the spinal canal, a large branch to the upper por- 

 tion of the Scalenus auticus (Fig. I., 12), and a large nerve form- 

 ing one of the roots of the Phrenic nerve (Fig. I. P.)- 



The remainder of the nerve, after furnishing a communicating 

 branch to the Fifth cervical, divides into two main branches. 

 The postero-external of these gives off a muscular branch (Fig. 

 I., 13) to the deep surface of the Levator clavicuhv (M. omo- 

 cleido-transversarius), and then divides into the Supra-acromial 

 nerves (Fig. I., 14, 14, 14). 



The antero-internal division furnishes the Supraclavicular and 

 Suprasternal nerves (Fig. I., 15, 15, 15). 



