306 



THE RABBIT 



coronoid fossa in front and the olecranon fossa behind ; the two 

 communicating by a supra-trochlear foramen. 

 (h) The radius, a long and slightly curved bone.. Its head is provided with 

 a double surface for articulation with the trochlea of the humerus ; 

 its distal extremity has a pair of slight concavities for articulation 

 with the carpal bones, the scaphoid or radiale and the semilunar or 

 intermedium. 



(c) The ulna, a long bone articulating at the elbow with the humerus and at 



the wrist or carpus with the cuneiform. Behind the elbow-joint it is 

 produced into the olecranon process, which fits into the olecranon fossa. 

 The radius and ulna constitute the fore-arm. 



(d) The carpus or wrist, consisting of two rows of carpal bones : — 



(i) The proximal row is composed of the scaphoid or radiale (on 

 the inner side and articulating with the radius), the semilunar 

 or intermedium (articulating with the radius), and the outer 

 cuneiform or ulnare (articulating with the ulna), 

 (ii) The distal row is composed of the trapezium (on the inner side 

 and articulating with the scaphoid, and forming the support 

 for the first metacarpal), the trapezoid (also articulating with 



;-/Acromium process 



Metacromium process 



Lesser trochanter 



Bicipital groove 



Glenoid cavity 



Supra 

 trochlear I /j 

 foramen JJ 



--Great trochanter 



-Deltoid ridge 



Olecranon fossa 



B. 



Trochlea 



Coronoid 

 fossa 



Trochlea 



Trapezoid Trapetium 



Metacarpals 



^Scaphoid 



Radius 



Semilunar 

 Cuneiform 



Ulna 



Olecranon process 



"TOsiriagPiinii'-^ 

 ,^ . / Unciform\_^ 



m 1 ""■'-'' Centrale 



Phalanges i 



Fig. 103. — The Rabbit {Lepus cuniculus). A. Left Scapula or Shoulder-blade ; B. Left 

 Humerus (from behind) ; C. Left Humerus (from in front) ; D. Skeleton of Fore-arm, 

 Wrist (carpus) and Hand (manus). 



