THE FORE LIMB 



195 



grooves and intervening tubercle are covered with fibro- cartilage, and 



over them plays, pulley-like, the broad 

 tendon of the flexor brachii muscle, 

 between which and the bone there is 

 a synovial membrane. 



Fig. 299. Humerus (Outer Aspect) 



1 Great Trochanter. Deltoid Tuberosity. 



3 External Tuberosity. * Epitrochlea. 6 Epi- 

 condyle. 6 Supra-condyloid Fossa. 7 Shaft of 

 Bone with the Furrow of Torsion. 8. Articular 

 Surface or Head. 



The lower extremity is smaller than the upper, 

 and in front presents two unequal rounded por- 

 tions separated by a superficial groove. These are 

 the internal and external condyles. Behind is a 

 deep pit (supra-condyloid fossa), which separates 

 two prominent ridges from each other, and re- 

 ceives into it a pointed process (peak) on the 

 elbow when the joint is in extreme extension. 



FOREARM 



Fig. 300. The Forearm: Radius 

 and Ulna 



1 Ulna. 2 Point of Ulna. 

 3 Beak of Ulna. 4 Radio-ulnar 

 Arch. 5 Radio-ulnar Articu- 

 lation. " Bicipital Tuberosity. 

 ? Shaft or Body of Radius. 

 8 Radio-carpal Articulation. 



Two bones, the radius and the ulna, which in early life are separate, 

 but in the adult are ossified together, constitute this region. 



Radius (fig. 300). This is the longest bone in the fore limb, and 



