THE MUSCULAR SYSTEM 



79 



the thigh upon the pelvis. Also called the tailors' muscle. 

 Nerve, anterior crural. 



The rectus f emoris arises from the anterior inferior iliac 

 spine. Insertion, in the patella. Action, flexes the hip- 

 joint. Nerve, anterior crural. 



FIG. 43. FIG. 44. 



FIG. 43. Muscles of leg and foot (from before): i, Tendon of rectus 

 femoris; 2, vastus internus ; 3, vastus extern us ; 4, sartorius ; 5, iliotibial band; 

 6, inner head of gastrocnemius ; 7, inner part of soleus; 8, tibialis anticus; 

 9, extensor proprius hallucis ; 10, extensor longus digitorum ; n, peroneus 

 longus; 12, peroneus brevis; 13, peroneus tertius ; 14, origin of extensor 

 brevis digitorum. 



FIG. 44. Superficial muscles of leg (from behind) : I, Vastus externus; 

 2, biceps flexor cruris ; 3, semitendinosus ; 4, semimembranosus ; 5, gracilis; 

 6 sartorius; 7, outer, and 8, inner, head of gastrocnemius ; 9, plantaris; 10, 



us; ii, peroneus longus; 12, peroneus brevis; 13, flexor longus digi- 

 torum ; 14, tibialis posticus; 15, lower fibers of flexor longus hallucis. 



Vastus Externus. -Origin, tubercle of the femur and 

 the great trochanter. Inserted into the outer side of the 

 patella. Action, extends the leg. Nerve, anterior crural. 



