SHOULDEX t ./AM/, I- OKI-.. I A'. I/. AND II . I .YD. 171 



They may become filled with provisional callus and bone, when a .stiff joint 

 will be the result. 



jfoic is tit-: posterior surface of the hiimerus occupied .' 



By the loii^ humeral head of the triceps above the musculo-spiral groove ; 

 by the short humeral head below the groove; by the musculo-spiral groove, in 

 which are the musculo-spiral nerve and superior profunda artery. 



lfo:c is the outer lip of the bicipital groovt occupied .' 



By the tendinous insertion of the pectoralis major muscle. 



I low are the outer and inner surfaces of t/te hiimerus occupied .' 



They are occupied by the pectoralis major, deltoid, and brachialis anticu 

 on the outer ; the teres major, latissimus dorsi, coraco-brachialis, and brachialis 

 anticus on the inner surface. 



//oiv is tlic external eondylar ridge occupied / 



By the supinator longus and the extensor carpi radialis longior ; the former 

 occupies the upper two-thirds, the latter the lower one-third of the ridge. 



Xante all tlie muscles attached to tlie middle one-third of the hiiinenis whose 

 action wottfd tend to displace tlie fragments in case of fracture in this locality. 



The long and short humeral heads of the triceps, the deltoid, the coraco- 

 brachialis, the brachialis anticus muscles. 



What might be tlie most serious complication of a fracture in the middle one- 

 third of the /in merits ? 



Compression and paralysis of the musculo-spiral nerve, in which there would 

 be inability to extend the carpus and digits and to supinate the radius. 



What is the direction taken by the nutrient foramen of the hiimerus? 



It conforms to the rule governing the direction of these foramina in the long 

 bones of the extremities : to the elbow and from the knee being the rule. 



Hoiv many muscles and ligaments are attached to the hiimerus / 



There are twenty-five muscles and eight ligaments attached. 



In this region you will find the following arrangement of 



Muscles Physiologically Grouped. 



Carpal Flexors. Flexor carpi radialis. 



Flexor carpi ulnaris. 



Palmaris longus. * 

 Digital Flexors. Flexor sublimis digitorum. 



Flexor profundus digitorum. 



Flexor longus pollicis. 

 Radial Pronators. Pronator radii teres. 



Pronator radii quadratus. 

 Forearm Flexors. Flexor biceps cubiti. 



Flexor cubiti brachialis anticus. 



Flexor brachio-radialis. 

 Nerves. Median nerve and its branches. 



Ulnar nerve- and its branches. 



Musculo-cutaneous nerve and its branches. 

 Arteries and Veins. Radial artery and the deep palmar arch. 



Ulnar artery and the superficial palmar arch. 



Common interosseous artery and vein. 



Anterior intprosseous artery and vein. 



Posterior interosseous artery and vein. 

 Surgical . \reas. The cubital fossa and its contents. 



The radial groove and its contents. 



The ulnar groove and its contents. 



