270 



3. 31. agitator caudcb (c), 0*03 oz. 



Origin ; from the ischiadic line, behind the glutceus maximus. 

 Insertion ; by a double tendon. 



1. One tendon passes through a pulley on the outside of the knee, 

 formed by the tendon of the biceps (d) as it passes to its fibular inser- 

 tion, and is then inserted in the head of the muscle {x\ in the calf of 

 thegeg. 



2. The second insertion is by means of a tendon that goes to the top 

 and front of the tibia ; this second tendon also serves to strap down the 

 tendon of the rectus femoris (a). 



4. M. biceps femoris (d), 0*05 oz. 



Origin ; from the ilioischium, under and behind the origin of the 

 glutceus maximus. 



Insertion ; partly into the top of the fibula, forming a pulley for 

 the agitator caudce(c), and an additional strap for the rectus fe- 

 moris (a) ; and partly by means of another tendon into the head 

 of the peronceus longus (g). 



5. M. semitendinosus (e), 0*18 oz. 



Origin ; from the posterior point of the tuber ischii. 



Insertion ; by a remarkable looped tendon, having one end inserted 



into the back of lower end of femur, and the other end into the 



os calcis. 



6. M. semimembranosus (/), 0*11 oz. 



Origin; tuber ischii. 



Insertion ; into the top of the tibia, by a tendon common to this 

 muscle and gracilis. 

 The muscles of the calf shown in the figure are the following : — 



7. M. gastrocnemius (u), 0*14 oz. 



This muscle, as usual, has an outer and inner head. 



Outer head, 0-11 oz. 



Origin ; from the tendon of the great caudal extensor of the thigh, 



half an inch from its insertion into the outer condyle (vide a, 



Fig. 20). 



Insertion; into the under side of the outer tarsal bone, and into the 

 plantar fascia. 



Inner head, 0-03 oz. 



Origin ; from the top of fibula and inner condyle of femur. 



Insertion; by a tendon, which unites with that of the outer head 

 before reaching the os calcis, under which it passes to be inserted 

 into the outer and under side of the outer tarsal bone. 



8. M. plantaris ? (x), 0*04 oz. 



Origin ; double ; from rectus femoris and from agitator caudce. 



Insertion ; having become partially blended with the outer gas- 

 trocnemius, it is inserted into the os calcis, and under surface 

 of the plantar fascia. 



