230 



OSTEOLOGY. 



ARTORIUS 



TENSOR FASCIA LA.T.E 

 REFLECTED HEAD 

 OF RECTUS FEMOR1S 

 STRAIGHT HEAD OF 

 RECTUS FEMORIS 



The ilium has two surfaces, medial and lateral. The lateral surface is divided 

 into two parts, viz., a lower, ace tabular, and an upper, gluteal part. The lower forms 

 a little less than the upper two-fifths of the acetabular hollow, and is separated 

 from the larger gluteal surface above by the upper prominent margin of the arti- 

 cular cavity. The gluteal surface, broad and expanded, is concavo-convex from 

 behind forwards. It is traversed by three rough gluteal (O.T. curved) lines, well seen 

 in strongly developed bones, but often faint and indistinct in feebly marked speci- 

 mens. Of these the linea glutsea inferior (inferior gluteal line) curves backwards 

 from a point immediately above the anterior inferior spine towards the greater sciatic 

 notch posteriorly ; the bone between this and the acetabular margin is marked by 

 a rough shallow groove, from which the reflected head of the rectus femoris muscle 



arises. The linea glutsea 

 .EXTERNAL OBLIQUE anterior (anterior gluteal 

 line) commences at the 

 crest of the ilium, 

 about one inch and a 

 half behind the anterior 

 superior iliac spine, and 

 sweeps backwards and 

 downwards towards the 

 upper and posterior 

 part of the greater 

 sciatic notch. The sur- 

 face between this line 

 and the preceding 

 furnishes an extensive 

 origin for the glutseus 

 minimus muscle. The 

 linea glutsea posterior 

 (posterior gluteal line) 

 leaves the iliac crest 

 about two and a half 

 inches in front of the 

 posterior superior iliac 



PYRAMIDALIS j i_ j j 



RECTUS ABDOMINIS spine, and bends down- 

 wards and slightly for- 

 wards in a direction 

 anterior to the posterior 

 inferior spine. The 

 area between this and 

 the anterior gluteal line 

 is for the origin of the glutseus medius muscle, whilst the rough surface immediately 

 above and behind it is for some of the fibres of origin of the glutseus maximus 

 muscle. 



The medial surface of the ilium is divided into two areas which present very 

 characteristic differences. The posterior or sacral part, which is rough, displays, in 

 front, a somewhat smooth, auricular surface (facies auricularis) which is cartilage- 

 coated in the recent condition, and articulates with the sacrum. 



This area is said to be proportionately smaller in the female, whilst curving round in front 

 of its anterior margin there is often a groove, for the attachment of the fibres of the anterior 

 sacro-iliac ligaments, called the pre-auricular sulcus. According to Derry this groove is better 

 marked in the female, and may be regarded as characteristic of that sex. 



Above and behind this there is an elevated irregular area, the tuberosity (tuber- 

 ositas iliaca), which is here and there deeply pitted for the attachment of the strong 

 interosseous and posterior sacro-iliac ligaments. Above this the bone becomes con- 

 fluent with the inner lip of the iliac crest, and here it affords an origin to the sacro- 

 spinalis and multifidus muscles, and some of the fibres of the quadratus lumborum. 

 The anterior part of the medial aspect of the bone is smooth and extensive ; it 



GEMELLUS INFER 

 GEMELLUS SUPERIOR 



PECTINEUS 



SEMIMEMBRANOSU 



BICEPS AND 

 SEMITENDINOSUS 



QUADRATUS FEMORIS 



ADDUCTOR LONGUS 

 GRACILIS 



ADDUCTOR BREVIS 



^^ 



ADDUCTOR MAGNUS 



FIG. 230. LATERAL ASPECT OP THE RIGHT HIP BONE WITH THE 

 ATTACHMENTS OF THE MUSCLES MAPPED OUT. 



