1 84 



PRACTICAL ANATOMY. 



The Pronator Quadratus. Observe the anterior interosseous nerve termin- 

 ating in this muscle. Detach the muscle from its ulnar origin, turn the same aside, 

 and see the anterior interosseous artery piercing the membrane and gaining the 

 posterior surface ; also see the anastomosis between a branch of this artery and 

 the anterior carpals. 



HEAD 



LESSER TUBEROSITY 

 Subscapularis 



Capsular ligament 



Coraco-brachialis brevis 

 (Rotator burner!) 



BICIPITAL GROOVE 



GREATER TUBEROSITY 



Transverse humeral ligament 



Fourth head of biceps 



Coraoo-brachialis 



Third head of bicepe 



Braehialis anticus 



Coraco-brachialis 



SUPRACONDYLOID PROCESS 



Pronator radii teres 



Capsular ligament 

 CORONUID FOSSA 



INTERNAL CONDYLE 

 Internal lateral ligament 



TROCHLEA 



ROUGH SURFACE FOR deltoid 



THE EXTERNAL CONDYLAR RIDGE 



RADIAL DEPRESSION 



EXTERNAL CONDYLE 

 CAPITELLUM 



FIG. 129. THK LEFT HU.MKKI s \\nii A SITK \OI\I>YI,<III) PROCESS AND SOME IRREGUI \K 

 MUSCLE ATTACHMENTS. (Anterior view.) 



The Flexor Longus Pollicis (Fig. 124). Notice and demonstrate on your 

 dissection that the origin of this muscle is limited above by the tuberosity and 

 oblique line of the radius ; that the lower part of the same is limited by the 

 pronator quadratus, the inner by the interosseous membrane. Trace this muscle 





