76 



ANIMAL MECHANISM. 



This variability in the point of attachment is still very 

 noticeable in the semi-tendinosus muscle, which derives its 

 name from the fact that in man, about half of the length 



Fio. 16. —Muscles of tbe thigh, in man. The sartorius muscle (above) and 

 the rectus interaas (below), are darkly shaded, that they may be more 

 easily recognized. The rectus internus is, at its lower extremity, pro- 

 vided with a long tendon ; its fleshy part is short, which is in harmony 

 with the slight extent of movement in this muscle, the attachment of 

 whicii is very close to the knee. The sartorius muscle is provided with 

 a short tendon at its inferior attachment. 



of the muscle is occupied by the tendon. In fact, the inferior 

 attachments of the semi-tendinosus in man is very close to the 

 articulation of the knee, but in apes, where it is attached 

 lower down, the muscle has almost entirely lost its teudon ; 

 it is altogether lost in the greater part of other mammals, in 

 the Coaita, for example. 



