674 



MAMMALIAN ANATOMY 



The anterior superior spine is prominent, and, with the part of 

 the border below, namely, the superior iliac notch, affords attach- 

 ment to the sartorius muscle. 



The fan-shaped outer surface, or dorsum, of the ilium (Fig. 523) 

 is undulating, and presents three gluteal ridges. 



The superior gluteal ridge runs from the posterior part of the crest 

 to the top of the greater sacro-sciatic notch ; the middle gluteal ridge 



FIG. 522. 



FIG. 523. 



INNER VIEW OF THE LEFT HIP BONE. 



The dotted line indicates its division into three parts : 

 1, the ilium; 2, the pubes; and 3, the ischium. (1, iliac 

 fossa) 4, crest of the ilium; 5, 6, anterior superior and 

 inferior spines; 7, 8, posterior superior and inferior 

 spines; 9, auricular surface for the sacrum; 10, rough 

 tuberosity for the attachment of ligaments. (2, body of 

 the pubes) 11, symphysis; 12, horizontal rarnus; 13, de- 

 scending rani us; 14, pubic crest; 15, pubic spine; 16, 

 pectineal line. (3, plane^of the ischium) 17, ramus of 

 the ischium ; 18, tuberosity ; 19, spine of the ischium ; 

 20, ilio-pubic ridge ; 21, obturator foramen ; 22, greater 

 sciatic notch; 23, lesser sciatic notch. 



OUTER VIEW OF THE LEFT HIP BONE. 



1, ilium ; 2, ischium ; 3, pubes. (1, dorsal surface 

 of the ilium) 4, crest of the ilium; 5, 6, 7, middle, 

 inferior, and superior curved lines or gluteal ridge ; 

 8, 9, anterior superior and inferior spines ; 10, 11, 

 posterior superior and inferior spines. (2, body of 

 the ischium) 12, spine of the ischium ; 13, greater 

 sciatic notch ; 14, lesser sciatic notch ; 15, tuber- 

 osity of the ischium; 16, ramus of the ischium. 

 (3, body of the pubes) 17, horizontal ramus of the 

 pubes; 18, descending raruus; 19, acetabulum; 20, 

 obturator foramen. 



curves backward from the crest at a point above the anterior superior 

 spine to the sciatic notch ; the inferior gluteal ridge passes from the 

 anterior superior spine to the inferior end of the sciatic notch. In 

 the area behind the superior ridge is attached the gluteus rnaxirnus 

 muscle ; the area between the superior and the middle ridge is occu- 

 pied by the gluteus medius, with the exception of a small space in 

 front, which affords origin to the tensor vaginae femoris ; in the area 

 between the middle and the inferior ridge is attached the gluteus 

 minimus. Below the lowest ridge the surface becomes convex, and 

 forms the upper rim of the acetabulum and two-fifths of the cavity 



