io6 The Alligator and Its Allies 



Triceps internus, Theil der Portion humerale 

 interne du triceps brachial, [Mittler] vom Humerus 

 ausgehender Kopf des Streckmuskels des Vor- 

 derarmes). Springs from the middle of the ex- 

 tensor surface of the humerus between the lateral 

 and medial heads. 



(e) Caput Humerale Mediale (Longius caput m. 

 brachiei interni, Theil des [inneren] kurzen Kopfes 

 des dreikopfigen Streckers, Theil der Portion 

 humerale interne du triceps brachial, [Innerer] vom 

 Humerus ausgehender Kopf des Streckmuskels 

 des Vorderarmes, Theil des Triceps Nr. 3, Theil 

 des Triceps internus). This head originates on 

 the medial part of the extensor surface of the 

 upper arm at the end of the medial process where 

 it is united with the scapulo-humeralis profundus 

 muscle. 



The muscle mass formed by the union of all the 

 above heads goes over, as a broad and somewhat 

 thick tendon, to become inserted on the proximal 

 part of the ulna. 



Humero-radialis (Plate I., Figs, i and 4, hr) 

 (Caput longum m. bicipitis, Eigener kurzer Beuger, 

 [Zweiter] vom Oberarm ausgehender Beuger, 

 Brachialis externus. Portion a of Brachi^Eus). 

 A fairly large muscle on the outer side of the upper 

 arm, lying between the brachialis inferior and 

 caput humerale laterale muscles, with, both of 

 which it is, at the beginning, united. It originates 

 with its deeper and chief mass from the outer 



