104 The Alligator and Its Allies 



major). Springs from the posterior half of the 

 upper region of the outer surface of the scapula. 

 It passes down, with converging fibers, to unite 

 with the latissimus dorsi muscle to form a strong 

 tendon that is inserted on the extensor surface of 

 the humerus. 



Subscapularis (Unterschulterblattmuskel) . 

 Springs from the inner surface of the scapula, 

 except from the suprascapula, goes with converging 

 fibers directly over the capsule of the shoulder 

 joint to be attached to the medial process of the 

 humerus. 



Anconceus. This strong muscle lies on the ex- 

 tensor side of the upper arm. It is made up of two 

 layers : the superficial comes from the pectoral gir- 

 dle in two heads: (a) the caput scapulare laterale 

 externum and (b) caput coraco-scapulare ; the 

 deeper layer originates on the humerus by three 

 heads, (c) caput humerale laterale, (d) caput 

 humerale posticum, and (e) caput humerale medi- 

 ale. These five heads of the anconasus muscle 

 with their synonyms will now be described. 



(a) Caput Scapulare Laterale Externum (Plate 

 L, Figs, i and 4, asl) (Brevi proximum caput m. 

 tricipitis, Gewohnlicher [ausserer] langer Kopf 

 des dreikopfigen Streckers, Portion scapulaire 

 externe du triceps-brachial, Erster langer Kopf 

 des Triceps, [Zweiter] abducirender vom Schulter- 

 gerust entstehender Kopf des Streckmuskels des 

 Vorderarmes, Triceps Nr. I, Triceps longus). 



