56 



24. 31. gastrocnemido-solceus. — This great muscle has four distinct 

 heads — 



(a). Prom the outer side of the patella and of the ligamentum pa- 

 tell SB. 



(ft). From the external condyle of the femur (Fig. 7.) 



(7). From the condyloid pit of the inner 

 condyle, between the Adductor ma gnus and 

 Flexor digitorum (Fig. 7). 



(e>). From the tubercle of the tibia at 

 both sides, and from the surface of the 

 lower patella, and by means of fascia, to 

 the upper part of the fibula. 



Altogether it weighs . . . 115 J oz. 



This enormous mass of muscles repre- 

 sents the gastrocnemius and solceus, inti- 

 mately connected in their fleshy portion, 

 but distinct both in origin and insertion. 

 It is inserted, as shown in Fig. 10, by 

 means of two powerful tendons into the 

 upper and back part of the metatarsus, the 

 tendon of the solceus being a little above 

 that of the gastrocnemius. 



It may be regarded as acting from the 

 circumference of a ring placed all round 

 the knee joint, to the tendo Achillis; and 

 its resultant pull is nearly in the axis of 

 the leg. 



25. 3131. flexores digitorum. — These 

 important muscles may, in the Ostrich, 

 be divided into two distinct groups : — 



A. — This group arises from a triple ori- 

 gin:— 



(«). The condyloid pit of the femur, 

 below the origin of the Gastrocnemius 

 (Pig. 7). 



(ft). From the outer side of the outer 



condyle of the femur (Fig. 7). 

 (7). A fleshy slip connects these flexors 



with the belly of the digastric rectus 



femoris in the calf of the leg. This 



slip is represented, cut off at the point 



b, in Fig. 9. 

 Their total weight is . . . . 1 6 oz. 



B. — This group has a double origin : — 

 (a). From the condyloid pit of the femur. 

 (/3). From the whole back of the fibula 



which is covered by the poplitceus. 



LEFT THIGH, LEG, AND FOOT OF THE 

 OSTEICH. 



a, Femur. 



b, Fibula. 



c, Insertion of biceps. 



d, Tibia. 



e, Tendon of solceus. 



f, ,, rectus femor is. 



g, Tendons of flexores digitorum. 



h, Tendon of gastrocnemius, 

 k, tibialis anticus. 



I, extensor digitorum. 



m, Metatarsus, or cannon bone. 



and tibia, except that part 



