iS 4 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. 



LESSER TUBEROSITY - 

 Subscapularis 



Capsular ligament - 



Coraco-brachialis brevis - 

 (Rotator humeri) 



BICIPITAL GROOVE 



Coraco-brachialis - 

 * Third head of biceps - 



Brachialis anticus . 



Coraco-brachialis . 

 SUPRACONDYLOID PROCESS . 



" rSS\**,j~^ GREATER TUBEROSITY 



\S I Transverse humeral ligament 



-/trJ^"' 



f Q .) 7 



Fourth head ol bicepa 



ROUGH SURFACE FOR deltoid 



THE EXTERNA1 CONDYLAR RIDGE 



Pronator radii teres . 



Capsular ligament 



CORONOID FOSSA . 



INTERNAL CONOYLE 

 Internal lateral ligament - 



RADIAL DEPRESSION 



EXTERNAL CONDYLE 

 CAPITELLUM 



FIG. 129. THE LEFT HUMERUS WITH A SUPRACONDYLOID PROCESS AND SOME IRREGI i AR 

 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 



