40 THE SUPERIOR EXTREMITY 



arm. At the distal end of the groove it pierces the lateral 

 intermuscular septum and enters the anterior compartment 

 of the arm. The point at which it pierces the septum may be 

 indicated on the surface at the union of the proximal and middle 



Spine of scapula N. suprascapularis 



j A M . dehoid.us 



M. infraspinatus 

 A. circumflex, scap. 



(O.T. dorsalis I. -^ 



scap.) 

 M. teres minor J 



M. subscapularisJ 



M. teres major 



Triang. space . 

 Quadrangular space 



M. triceps cap. long 

 N. radialis (O.T. musculo-spiral) 



Bursa subacromialis 



M. infraspinatus 

 _ Capsula artic. Articulat. 

 humeri ; 

 N. to m. teres minor 



M. deltoideus 



N. axillaris (O.T. 

 circumflex) ram. sup. 

 N. axillaris, 

 ram. inf. 



N. cutan. brach. 

 ~ lat. 



- M. triceps, cap. lat. 



A. brachialis 

 M. triceps, cap. lat. 



N. to m. triceps, cap. nied. 



M. triceps, cap. med. 



N. ulnaris 



Epicond. med 



N. flex. carp. uln. 



Olecranon --. 



N. radialis (O.T. 

 musculo-spiral) 



A. prof, brachii ram. ant. 



A. prof brachii ram. post. 

 N. cut. antib. dorsalis 

 M. brachialis 



Epicond. lat. 



A. inteross. recurr. 



M. anconaeus 

 Mm. ext. dig. 

 comm. et dig. quint. 

 M. ext. carp, ulnaris 



FIG. ii. The Back of the Arm. 



thirds of the line joining the lateral epicondyle to the insertion 

 of the deltoid. A line drawn across the back of the arm from 

 the termination of the axillary artery to this point maps out 

 the nerve as it lies in the radial groove. 



In the anterior compartment the radial (musculo-spiral) 



