31. CLA VO-DELTOIDEUS. 231 



form the direct continuation of the latlsshnus, while the remainder 

 is chiefly muscular. The cephalic surface presents the opposite 

 appearance, being muscular as to its j^roximal tiftii. In general, it 

 is as if the shorter tendon of the teres were apj)lied upon the longer 

 tendon of the latlssimus in such a way that the distal border of the 

 latter sliows upon the caudal surface of the joint tendon, while the 

 j)roximal border of the former shows upon the cephalic surface. 



The area of attachment (Fig. 71, 72) is about one seventh of the 

 length of the entire humerus, and forms an elongated fossa u2:)on 

 the caudal surface, near the ventral border ; its proximal end is 

 opposite the distal end of the area of insertion of the short head of 

 the coracoideus. 



M. CLAVO-DELTOIDEUS. 



§ 637. Synonymy. — The c'nvicular portion of the human deltoideits, G., A, 444 ; Q., 

 A. 1, 199 ; " delto claviculaire " S.-D., A, II, 351 ; ''portion dn mastoido-humernl," Ch., A, 

 209 ; portion of the mudaido-humeral, Ch. (Fl.), A, 197 ; poi'tioji of the ccphalo-humeral, 

 Miv., B, 147 ; Wood, 9, 101. 



Figures. — Ectal aspect, clavicular end (66); ectal aspect of whole (7?, right side); 

 ental aspect of antehrachial part (72, left side). 



Posture. — Latericumbent, the venter toward the dissector. Se- 

 cure the arm caudiducted so as to stretch tlie muscles upon the 

 ventral aspect of tlie brachium and shoulder. 



Exposure. — The proximal end of the muscle was exposed dur- 

 ing the exposure of the clavo-trapezius. Connect the vertebro-pre- 

 sternal incision made in exposing the trapezii with the dorsal border 

 of the antebrachium, at the junction of the j^roximal and middle 

 thu-ds, by an incision along the ventral border of the brachium and 

 passing can dad of the elbow. Reflect both edges of the skin for 

 2-3 cm. near the shoulder, and for 1-2 cm. near the elbow. 



General Description. — Teeniate ; along the ventral aspect of 

 the brachium, from the clamcle to the ulna. 



Dissection. — Draw the clavicular portions of the claoo-trapezius 

 and clavo-mastoideus away from the body so as to expose the more 

 or less distinct bands — hardly deserving the name of ligaments — 

 which pass from the ends of the clavicle to the shoulder and neck. 

 In a subsequent dissection of the parts these connections may be 

 studied in detail before division. Divide them and draw the same 

 muscles cephalad so as to render tense the clavo-deltoideus, and 

 indicate the general position and direction of its borders. 



The caudal border beo-ins at the sternal end of the clavicle. 



