220 ANATOMY OF THE RABBIT 



angles of the scapula; on the pelvic girdle, the iliac crest, 

 pubic symphysis, and ischial tuberosity. 



4. In the anterior limb: 



(a) The division of the free portion into three segments, the 

 arm (brachium), forearm (antibrachium), and hand 

 (man us). 



(b) The position of the elbow (cubitus) in comparison with 

 the knee (cf. p. 70). 



(c) The five digits, designated from the medial side as: first 

 (d. primus), or pollex; second (d. secundus), or index; 

 third, or middle (d. tertius s. medius) ; fourth (d. quartus) ; 

 and fifth (d. quintus s. minimus). 



5. In the posterior limb: 



(a) The division into three segments, the thigh (femur), leg 

 (crus), and foot (pes). 



(b) The knee (genu), and the popliteal fossa of its posterior 

 surface, the latter not well defined. The projection of the 

 heel (calx), and the angle formed by the foot with the leg. 



(c) The four digits (dd. secundus — quintus). The vestigial first 

 digit, or hallux, is not distinguishable externally. 



II. THE ABDOMINAL WALL 



1. Place the animal on its back. Make a median incision of the 

 skin of the ventral surface extending from the pubic symphysis 

 to the manubrium sterni, being careful not to cut through more 

 than the skin itself. Make two transverse incisions through the 

 skin on the left side, the first passing just behind the arm, the 

 second just in front of the thigh, both extending round to the 

 dorsal surface. Work the flaps loose from the surface, using 

 the handle of the scalpel, until the side of the trunk is well 

 exposed, but leave them attached to the body. On the right 

 side of the body it is sufficient to clear the middle line. Identify 

 the structures as follows: 

 On the inner surface of the skin: 

 (a) The thick compact connective tissue forming the corium. 



