272 



MUSCLES OF THE LOWER LIMB. 



The psoas magnus arises from the upper and lower lateral parts of the 

 bodies of the last dorsal and of all the lumbar vertebrae, from the interposed 

 fibro- cartilages, and from the anterior surface and lower margin of the 

 transverse processes of the lumbar vertebrae near their bases. It forms a 

 thick elongated muscle, and is inserted into the small trochanter of the 

 femur by means of a tendon, which is placed at first within the substance of 

 the muscle, and afterwards at its outer side, receiving in this manner the 

 fibres of the iliacus as well as those of the psoas. 



Fig. 209. 



Fig. 209. DEEP DISSECTION OP THE MUSCLES OF THE ABDOMEN AND PELVIS. 



a, twelfth dorsal vertebra ; b, fifth lumbar vertebra ; c, transverse process of the first 

 lumbar vertebra ; 1, quadratus lumborum muscle ; on the left side, its fibres of origin 

 from the transverse processes of the lumbar vertebrae are shown by the removal of the 

 psoas muscles ; 2, placed upon one of the intertransversales muscles of the left side ; 3, 

 marks the upper part of the psoas parvus, drawn somewhat to the outer side ; 3', the 

 insertion of its tendon into the brim of the pelvis ; 4, points to the upper part of the 

 paoas magnus ; 4", one of the origins of the muscle ; 4', the insertion of the muscle into 

 the lesser trochanter of the femur ; 5, iliacus internus, shown fully on the left side by 

 the removal of the psoas muscles ; 5', insertion of the iliacus muscle into a Hue below 

 the trochanter minor ; 6, pyriformis muscle of the left side rising within the pelvis from 

 the sacrum ; 6', insertion of its tendon into the summit of the great trochanter; 7, the 

 obturator externus seen from before on the left side ; + +, the right and left tendinous 

 pillars of the diaphragm on the front of the upper lumbar vertebrae. 



