138 EQUINE ANATOMY. 



Muscular attachments of the anterior extremity 

 to tlie trunk. 



Pectoral or Axillarj jpeg|on.--J. Superficial pec- 

 TORAL. — Synonyms, ^ ^e^t orfiho trftnoFcron s , (P). Divis- 

 ion : 1 — Sterno-li^eralis. Attachment^: Anterior ap- 

 pendix and inferior border of tlie sternum, anterior crest 

 of theh^Kfiery^^^Aotion : Adductor of the forearm. 

 2— SSrn^ap^^ii^oticus^ Attachments: Entire inferior 

 boroerof tlie sternum, anterior ridge of the humerusj 

 fascia of tlie external face of the anti-brachial aponeu- 

 rosis. Action : Adductor of the leg and tensor of the 

 aponeurosis. 



2. Deep pectoral. — Division : 1 — Sterno-trochineus. 

 Synonyms. Fectoralis mao^n us, (P). Attachments: 

 Tunica abdominalis, two posterior thirds of the inferior 

 border of the sternum, internal tubercle of the superior 

 extremity of the humerus. Action : Draws the leg back- 

 wards. 2 — Sterno-prescapularis. Synonyms. Pectoralis 

 ^aiivns , (P). Attachments : On the side of the sternal 

 keel, the cartilages of the three or four first ribs, the 

 aponeurosis covering the antea-spinatus muscle, the 

 cervical angle of the scapula. Action : Draws the 

 shoulder backwards and downwards, and tensor of 

 the scapular aponeurosis. 



