126 



U.S. NATIONAL MUSEUM BULLETIN 2 73 



coming fleshy. In the female they did not extend caudally on both 

 sides beyond the disk between L 2 and 3, and in all specimens the 

 cranial bundles came from the disk between the last thoracic and 

 first lumbar vertebrae. The psoas minor runs distally on the lateral 

 side of the vertebral column under the medial lumbocostal arch. It 

 changes into a shiny and strong tendon at the level of the fourth 

 lumbar vertebrae, where it is medial to the psoas major. Further 

 down in the pelvis it lies between that muscle and the iliac vessels, 

 with a well-developed fascia transversalis intervening. As the psoas 

 minor approaches its ending, the tendon broadens considerably and 

 is now transversely flattened. Insertion is on the distal end of the linea 

 arcuata (fig. 22). Sirena (1871) emphasizes the development of this 

 muscle in Alouatta with relation to man. His findings agree with mine. 



Nerve supply: A branch from the genitofemoral nerve (fig. 35). 



Function: Bends the lumbar spine forward. 



M. sartorius: A long and ribbon-like muscle found diagonally 



Figure 37.— Medial view of the knee (1, lig. collaterale tibiale; 2, m. sartorius; 3, m. gracilis; 

 4, m. semitendinosus; 5, m. semimembranosus; 6, m. gemellus medialis; 7, m. ischio- 

 condyloideus; 8, m. vastus lateralis; 9, m. rectus femoris). 



