1332 



SURFACE ANATOMY AND SURFACE MARKINGS 



curved line, with its convexity upward, between the styloid processes of the radius 

 and ulna; the summit of the convexity is about 1 cm. above the center of a straight 

 line joining the two processes. 





Sheaths of terminal 

 parts of Flexores 

 digitorum 



Muscles of thenar 

 eminence 



Sheath of Flexor 

 pollicis longus 



Sheath of Flexor carpi 

 radialis 



Muscles of hypo- 

 thenar eminence 



Common slicalh of 

 Flexores digitorum 

 sublimis and 

 profundus 



Flexor carpi ulnaris 



FIG. 1233. The mucous sheaths of the tendons on the front of the wrist and digits. 



Muscles. The only muscles of the upper extremity which occasionally require 

 definition by surface lines are the Trapezius, the Latissimus dorsi, and the Pectorales 

 major and minor. The antero-superior border of Trapezius is indicated by a line 

 from the superior nuchal line about 3 cm. lateral to the external occipital protuber- 

 ance to the junction of the intermediate and lateral thirds of the clavicle; the line 

 of the lower border extends from the spinous process of the twelfth thoracic vertebra 

 to the vertebral border of the scapula at the root of the spine. The upper border 



