MYOLOGY 



71 



The innervation of the two psoas muscles is by branches 

 of the lumbar nerves. 



M. iUacus (figs. 6, 12, 17, 32, 33) is the deepest of the 

 muscles of the ilium from the lateral aspect. It arises 

 upon the inferior border of the crest of the ilium caudad 

 along the iliacal ridge almost to the femoral process. It 



Oe'ne.l superior 



, pyrtformis 



obturat inlenu 



•oeTTiel mler. 



6T.TB0CHHNT. 



N. lemoralls — 

 N. obturaLtoriua— ~— 

 H. gluteus ^u^rior 

 N. IscHlitlcus 



N. pud&Tvdus— i^i 



Fig. 16. A, Deeper gluteal musculature upon the left side of Homo- 

 dontomys, with three most superficial glutei removed. 



B, Semidiagrammatic presentation of right lumbar plexus of Homodon- 

 tomys. (Last five lumbar and first sacral vertebrae shown on right.) 



is inserted upon the cranial border of the lesser trochanter 

 of the femur. 

 The innervation of the iliacus is by the femoral nerve. 



2. Gluteal group 



This group comprises the 



Mm. gluteus superficialis 

 gluteus maximus 



gluteus medius 

 gluteus minimus 



