306 



Muscles of the Arm. 



Spina scapulae i sawed through) 

 M. supraspinatus 



Scapula 



M. teres 

 major 



351. Muscles of the 

 right upper arm 



(deep layer), viewed from 

 behind. 



(The acromion has been sawed 

 through, the mm. infraspinatus and 

 teres minor have been com])letely, 

 the caput laterale m. tricipitis 

 partially, removed.) 



M. triceps brachii (continued). 

 Caput laterale: from tlie faeies 

 posterior humeri, lateral from and 

 above the sulcus n. radialis, as well 

 as from the septum intei'miiscularc 

 lat^'rale; the fillers run, iiarallcl, 

 downward, bridging over the sidcus 

 n. radialis (with tlio a. i)rofuiula 

 brachii and the n. radialis) and 

 extend j)artly over the pdstcrinr 

 surface uf the caput mediale to tlie 

 upjx'r and lateral margin of the 

 t<Mid(in (if the same. Insertion: 

 (decrannn ulnae (bursa olecraui 

 see Fig. ;j(;0). Action: it adducts 

 the upjier arm, and extends the fore- 

 arm. Innervation: n. radialis. 



Bursa in. iiifraspiiiati, small, 

 frenuently present, iictween the ten- 

 don of insertion of tlie m. infra- 

 spinatus and the e.ipsule nt the jiiint. 



Capsula articulari.? 



Bursa 

 m. iufraspinati 



M. iiifra.?piratus 

 (cut through) 



M. teres minor 

 (cut through) 



>I. triceps brachii 



(caput laterale) 



(cut through) 



N. radialis 



Septum 



intermusculare 



laterale 



M. triceps brachii 

 (caput laterale) 

 icut throughi 



M. triceps brachii 

 (caput mediale) 



- M. brachioradialis 



M. extensor 



carpi radialis 



longus 



jCpieoiiilylus 

 lateralis 



M. anconaeus 



M. extensor 



cari)i radialis 



brevis 

 _M. extensor 

 digitonini 

 communis 



j\l. extensor 

 carpi ulnaris 



