l6 HEAD AND NECK. 



branches. DEEP BRS.: Communican' tea s loop between ist 

 and ad, to sympathetic, hypogiossal, pneumogastric, and 

 spinal accessory nerves. MuscuJa'res, from ist. Commu'nt- 

 cans no'ni, from 2d and 3d, uniting with descendens noni. 

 2^hren!tcus t from 3d, 4th and 5th | crosses subclavian artery 

 down to middle mediastinum, thence to pericardium, dia- 

 phragm and pleura. The left is the longer. POSTERIOR 

 BRANCHES: each have external and internal divisions sup- 

 plying the muscles of the back of the neck, etc. Sub-occiJ>i- 

 ia'lis, from ist, up to sub-occipital region. Occipita'lis ma'jor, 

 the internal branch from the 2d cervical. Occipital branch, 

 from the 3d cervical, internal branch. All the others havfc 

 only the external and internal branches, supplying the mus- 

 cles contiguous to them. 



EXTREMITY. 



MUSCLES. 



(l) ANTERIOR THORACIC REGION 3. 



PeC'.OriliS ma'jor: sternal half clavicle, % front of sternum 

 down to 7: h rib, cartilage of true ribs, aponeurosis- external 

 oblique anterior bicipital ridge of humerus. [Anterior tho- 

 racic.] 



Pectoral!] mi'no: : 3d, 4th and sth ribs anterior border cora- 

 coid process of scapula. [Anterior thoracic.] 



Subcla'viUS I ist rib-cartilage under surface middle 3d of 

 clavicle. [Branch from 5th and 6th cervical.] 



(2) LATERAL THORACIC REGION I. 



S^ira'tllS Juag'miS \ 9 digitations frcm the 8 superior ribs 

 whclj length inner margin scapula, posterior surface. [Poste- 

 rior thoracic.] 



(3) ACROMIAL REGION I. 



Del'oide'ui: outer 36. anterior border, upper surface, of 

 clavicle ; outer margin, upper surface acromian crocess; whole 

 length lower border spine of scapula prominence outer sur- 

 face (middle) humerus. [Circumflex.] 



(4) ANTERIOR SCAPULAR REGION I. 



Ehibscaptlla'ris : inner % subscapular fossa lesser tuberosity 

 humerus. [Subscapular.] 



(5) POSTERIOR SCAPULAR REGION 4. 



Supra-Sp'na'ttlS : internal 2/ of supra-spinous fossa of scapula 

 upper facet greater tuberosity humerus. [Supra-scapu- 

 lar.] * 



ZafrSrEpfca'ttlS ! internal % of infra-spinous fossa middle 

 facet greater tuberosity humerus. [Supra-scapular.] 



