The Gluteal and Femoral Muscles in a Marmoset. 189 



vastus externus. luternally it was limited by the insertion 

 of pectineus, where some mixing of the fibres of the two 

 muscles took place. 



Crureus took origin from about three-fourths of the shaft 

 of the femur, below the origins of the vasti. Above it arose 

 from the anterior and outer surfaces only, leaving the inner 

 surface of the femur bare of muscular attachment. In the 

 lower two-thirds its origin occupied the anterior, outer, and 

 inner surfaces of the femur. 



As the three muscles approached their insertion, the two 

 vasti diminished in size, converged, and became tendinous. 

 From both tendons a superficial aponeurotic expansion was 

 given off. The expansion from the vastus externus was 

 attached to the outer side of the tendon of rectus, to the side 

 of the patella and the ligamentum patellae, becoming con- 

 tinuous with the capsule of the knee joint and with the 

 fascia of the leg. The expansion from vastus internus was 

 attached to the inner side of the tendon of rectus, the 

 patella and ligamentum patellae. Internally it was attached 

 to the internal lateral ligament of the knee, below it joined 

 with the insertion of sartorius. 



The aponeurotic expansions having been given off, the 

 converging tendons of the two vasti met and joined together 

 in front of the crureus and behind the tendon of rectus, and 

 were inserted into the upper border of the patella. On the 

 deep surface of the blended tendons there was found a 

 flattened piece of cartilage measuring about 4 millimetres 

 each way. On the superficial surface of the cartilage were 

 the fibres of the tendons of the vasti in which it lay. Into 

 its deep surface, and its upper and inner borders, most of the 

 fibres of crureus were inserted. The remaining fibres of 

 crureus were inserted into the upper end and inner side 

 of the synovial capsule of the knee, which protruded upwards 

 under the crureus and the tendinous expansions of the vasti. 

 These few muscle slips, constituting the sub-crureus, could 

 not be separated, except very artificially, from the crureus. 



Each of the heads of the quadriceps was supplied by one 

 or more branches from the anterior crural nerve. 



All through the Primates the quadriceps is justly so 



