VENTRAL MUSCLES OF NECK 



225 



ft passes forward, outward, and upward, crossing over the sterno-cephalicus and 

 jugular furrow obliquely. On reaching the surface of the mastoido-humeralis 

 it adheres closely to this muscle, and soon thins out, to be continued over the 

 splenius and trapezius ])y an aj^oneurosis which is difficult to remove from the latter 

 muscle. Scattered bundles may be traced on the ventral surface of the neck to 



Fig. 177. — Antero-latkr.\l View of Muscles and Skeleton of Horse. 

 a, Trapezius; c, mastoido-humeralis; d, sterno-cephalicus; /, long head of triceps; /', external head of 

 triceps; y, anterior superficial pectoral muscle; y', posterior superficial pectoral; h' , anterior deep pectoral; v, 

 cervical panniculus; z, supraspiiiatus; :39, omo-hyoideus; 30, sterno-thyro-hyoideus; 31, jugular vein; 3S, 

 cephalic vein; 1. scapula; 1' , cartilage of scapula; 3, spine of scapula; 4. shaft of humerus; 4', external epi- 

 condyle; .5, external tuberosity of humerus; 6, deltoid tuberosity; 74, ventral border ("keel") of sternum; 14', 

 cariniform cartilage; I.R., first rib. (After EIlenberger-Baum, Anat. fiir Kiinstler.) 



the facial portion. The right and left muscles meet at a ventral median raphe in 

 pennate fashion. 



2. Mastoido-humeralis. — This is described on p. 252. 



3. Stemo-cephalicus (Sterno-maxillaris s.-mandibularis)/ — This is a long, nar- 



iThis muscle is probably the homologue of the sternal portion of the sterno-cleido-mastoid 

 of man. On account of the differences in its insertion in the various animals, it seems desirable 

 to adopt the name sterno-cephalicus. . . 



15 



