Caput humeri 



.Mux-b's of till' Ann. 

 Pi-ocessus coracoideus 



303 



Caput breve 



m. bicipitis 



(cut through) 



M. 

 coracobrachialis 



Tuberositas 

 deltoidea 



Septum 



iutermusculare 



laterale 



Epicondylus 

 lateralis 



Capsula 

 articularis 



Bursa 

 bicipitoradialis 



Tendo 



111. bicipitis 



(cut through) 



Radius 



Bursa 



tendon of tbr 



Scapula 



Epi- 

 loudylus 

 niedialis 



348. Muscles of the 

 right upper arm 



(2"^ layer) , viewed from in 

 front. 



M. brachialis (0. T. brachialis 

 anticiis) (see also Figs. 342 and 347). 

 Form: flat, spindle-shaped. Po- 

 sition: on the anterior surface of 

 the upper arm, covered for the most 

 part hy the ra. biceps; the grooves 

 left free in fi-ont of it, medianward 

 and lateralward, near the m. biceps, 

 are called the snlcus hicipitalis nie- 

 dialis and lateralis (see Fig. 347). 

 Origin: fleshy from the septa inter- 

 muscularia and from the facies an- 

 teriores humeri, siirrotmdmg, above, 

 the insertion of the m. deltoideus like 

 a horse-shoe and often fused with the 

 insertion of the m. coracobrachialis. 

 Insertion: the fibers converge and 

 go by a short tendon to the proc. 

 coronoideus and to the tuberositas 

 ulnae. Action: it flexes the forearm. 

 Innervation: n. musculocutaneus. 



Bursa bicipitoradialis, con- 

 stant; between the tuberositas radii 

 and the tendon of the m. biceps. 

 cubitalis interossea, olten present in later life; adjoining, lateralward, the 

 m. biceps, medianward, the ulna and chorda obliqua, behiud, the m. supinator. 



20=^ 



Tuberositas 

 ulnae 



Bursa cubitalis 

 interossea 

 Chorda obliqua 



riua 



