MUSCULAR SYSTEM OF THE RED HOWLING MONKEY 



127 



across the ventral aspect of the thigh from the innominate bone to 

 the tibia. The origin is from the distal part of the acetabular border 

 together with the tensor fasciae latae and scansorius (fig. 36). The 

 fleshy fibers of the sartorius intervene here between these two muscles 

 and the iliac insertion of the external oblique aponeurosis. The muscle 

 passes distally over the quadriceps to the medial aspect of the knee 

 where it lies over the endings of both m, gracilis and the semitendino- 

 sus. It now expands fanwise to be inserted on the proximal fourth of 

 the medial aspect of the tibia (figs. 37, 38). Here, the highest sartorial 

 fibers end at about 1.5 cm below the corresponding condyle. The 

 muscle contributes to form the pes anserinus with the gracilis and 



Figure 38. — Muscular attachments in the leg: a, lateral view; b, dorsal view; c, medial 

 view (1, patellar tendon; 2, m. sartorius; 3, m. gracilis; 4, m. semitendinosus; 5, m. tibialis 

 posterior; 6, m. flexor digitorum tibialis; 7, m. popliteus; 8, m. semimembranosus; 9, m. 

 soleus; 10, m. flexor digitorum fibularis; 11, m. peroneus longus; 12, m. peroneus brevis; 

 13, m. peroneus digiti quinti; 14, m. tibialis anterior; 15, m. biceps femoris). 



