80 ANATOMY OF THE WOOD EAT 



The adductor mass of the thigh is divisible into three 

 muscles. It is unfortunate that their estabhshed names 

 are so misleading in the case of rodents; and yet it seems 

 unwise to adopt others as substitutes just now. 



M. adductor longus (figs. 7, 32, 33) is the shortest one 

 of the adductors and is the more caudal one of the two, 

 small, triangular muscles upon the medial surface of the 

 leg. Its fleshy origin, partly superficial to that of the 

 gracilis anticus, is from the pubis, extending from the 

 midsymphysis forward to the pectineal process. It con- 

 verges to a slender tendon which is inserted upon the caudal 

 border midway of the femur and just distad of the pec- 

 tineal insertion. 



In Teonoma this muscle usually hes entirely superficial 

 to the origin of the gracihs anticus, but there is some varia- 

 tion in this respect. 



M. adductor brevis (figs. 6, 7, 17, 32, 33) is the more 

 lateral and shorter one of the two remaining adductors. 

 Its fleshy origin is along practically the entire length of the 

 pubis between the adductor magnus and the obturator 

 extemus. Insertion is for a distance of about 12 mm. 

 along the cranial border of the lateral crest of the femur, 

 extending almost equidistantly either way from its most 

 prominent point. 



M. adductor magnus (figs. 6, 7, 17, 32, 33) has origin 

 from the cranial two-thirds of the ventral pubis. Insertion 

 begins immediately distad of the insertion of the adductor 

 brevis along the remainder of the caudo-lateral border of 

 the shaft of the femur. A portion curves around to infold 

 the insertional end of the semimembranosus anticus, and 

 passes to an insertion upon the medial portion of the cap- 

 sule of the knee joint. The femoral artery, in passing 

 from the iliopectineal fossa to the popliteal space, pierces 

 the caudal border of the adductor magnus, as it does in 

 man, and then extends between the more lateral portion 



