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. 
Anconeus. 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 anconeus muscle 
with their synonyms will now be described. 
(a) Caput Scapulare Laterale Externum (Plate 
I., Figs. 1 and 4, asl) (Brevi proximum caput m. 
tricipitis, Gewohnlicher [ausserer] langer Kopf 
des dreiképfigen Streckers, Portion scapulaire 
externe du triceps-brachial, Erster langer Kopf 
des Triceps, [Zweiter] abducirender vom Schulter- 
gertist entstehender Kopf des Streckmuskels des 
Vorderarmes, Triceps Nr. 1, Triceps longus). 
