The Muscles 105 
This muscle springs as a tendon from the hinder 
border of the scapula directly beneath the articular 
cavity, and extends back, between the scapulo- 
humeralis profundus and the dorsalis scapulze 
muscles, into the muscle belly. 
(b) Caput coraco-scapulare (Plate I., Figs. 2, 4, 5, 
6, acs) (Externum caput m. tricipitis, Innerer 
langer Kopf des dreikopfigen Streckers, Portion 
scapulaire interne du triceps-brachial, Zweiter 
langer Kopf des Triceps, [Erster] abducirender vom 
Schultergertst entstehender Kopf des Streck- 
muskels des Vorderarmes, Triceps Nr. 2, Triceps 
longus secundus). Arises by two distinct tendi- 
nous tips—the upper, weaker one from the hinder 
border of the scapula, the lower, broader one from 
the hinder border of the coracoid. 
(c) Caput Humeri Laterale (Plate I., Figs. 1 and 
A, ahl) (Brevius caput m. brachiei interni, [Aeus- 
serer] kurzer Kopf des dreiképfigen Streckers, Por- 
tion huméral externe du triceps brachial, Aeusserer 
vom Humerus ausgehender Kopf des Streck- 
muskels des Vorderarmes, Theil des Triceps Nr. 
3, Triceps externum). Springs from the lateral 
part of the extensor surface of the humerus dorsal 
to the lateral process and the origins of the humero- 
radialis and brachialis superior. 
(d) Caput Humerale Posticum (Plate I., Fig. 4, 
ahp) (Longissimum caput m. brachiei internum, 
Theil des inneren [kurzen] Kopfes des dreiképfigen 
Streckers, Theil des Triceps Nr. 3, Theil des 
