THE FORE LIMB 



195 



grooves and intervening tubercle are covered with tibro- 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 A.spoct 



■ Great Trochanter. ^ Deltoid Tuberosity. 



3 External Tuberosity. "* Epitrochlea. ^ Epi- 

 conilyle. ^ Supra-condyloid Fossa. ' 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 {j^eah) on the 

 elbow when the joint is in extreme extension. 



FOREARM 



Fig. 300.- 



-The Forearm : R.idius 

 and Ulna 



' Ulna. 2 Point of ^Tina. 



3 Beak of Ulna. ** Radio-ulnar 

 Arch. ^ Radio-nlnar Articu- 



lation. ** Bicijiital Tuberosity. 

 7 Shaft or Body of Radius. 

 '^ Radio-carpal Articulation. 



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

 but in the adult ai'e ossified together, con.stitute this region. 



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



