94 TRANSACTIONS OF THE [jAN. 11, 



Fig. IV. 



Plan of distribution of N. Auricularis magnus and N. Cervicalis super- 

 ficialis in Macacus rhesus. 



1 . Branch to integument of post-auricular and mastoid regions. 



2. Cranio-auricular branch. 



3. Branch to Cyniba. 



4. Branch to Ext. auditory meatus. 



5. 6. Branches to integument of Parotid region. 

 C. II. Anterior division of Second Cervical nerve. 

 C. III. Anterior division of Third Cervical nerve. 

 /), N. Cervicalis descendens superior. 



D^, N. Cervicalis descendens inferior. 



«, Branch of First Cervical nerve, giving off : 



1. C, centrally directed bundle within the sheath of the Hypoglossal. 



2. B. a. mi, and R. a. ma, branches to Rectus capitis anticus major and 

 minor. 



3. d, and d/, branches to N. Cervicalis descendens. 

 h, Loop between First and Second Cervical nerves. 

 e, Loop between Second and Third Cervical nerves. 



F, F, Ansa cervicalis profunda, formed by N. Cervicalis descendens su- 

 .perior (D) and inferior (D^). 



g. Branch of Second Cervical nerve passing to peripheral distribution of 

 Hypoglossal. 



F^, F'^, Branch of Third Cervical passing to peripheral distribution of Hypo- 

 glossal. 



Thy. hy, Branch to Thyro-hyoid muscle. 



Gen. hy. Branch to Genio-hyoid muscle. 



Ovi. hy. ant. Branch to anterior belly of Omo-hyoid muscle. 



St. hy., Branch to Sterno-hyoid muscle. 



St. thy.. Branch to Sterno-thyroid muscle. 



Om. hy. pos., Branch to posterior belly of Omo-hyoid muscle. 



Fig. V. 



Plan of Cervical Plexus and Ansa cervicalis profunda in man (after Holl). 



XII. Hypoglossal nerve. 



C. I. Anterior division of First Cervical nerve. 



4. Branch to the dorsal zone of the cutaneous distribution of cervical 

 plexus. 



5. Branch to Sterno-mastoid. 



6. Branches of XI. to Levator clavicula; and Trapezius. 



7. Continuation of XI. 



Fig. VL 



Right deep cervical ansa of the Macacus rhesus. 



XII. Hypoglossal. -^ X. Vagus. 



C. I. Anterior division of First Cervical nerve. 



C. II. Anterior division of Second Cervical nerve. 



C. III. Anterior division of Third Cervical nerve. 



1 and 3, Branches of C. II. to the prsevertebral muscles. 



2. Branches of C. II. to Vagus. 



Thy. hy. Branch to the Thyro-hyoid muscle. 



St. hy. Branch to the Sterno-hyoid muscle. 



St. thy. Branch to the Sterno-thyroid. 



Om. hy. Branch to the Omo-hyoid. 



