466 



AWl 



FIG. 430 Muscles of the iliac and anterior 

 femoral regions. 



MYOLOGY 



I. THE MUSCLES AND FASCLE OF THE 

 ILIAC REGION (Fig. 430). 



Psoas major. Psoas minor. Iliacus. 



The Fascia Covering the Psoas and Iliacus is 

 thin above, and becomes gradually thicker 

 below as it approaches the inguinal ligament. 



The portion covering the Psoas is thickened 

 above to form the medial lumbocostal arch, 

 which stretches from the transverse process of 

 the first lumbar vertebra to the body of the 

 second. Medially, it is attached by a series of 

 arched processes to the intervertebral fibro- 

 cartilages, and prominent margins of the bodies 

 of the vertebrae, and to the upper part of the 

 sacrum; the intervals left, opposite the con- 

 stricted portions of the bodies, transmit the 

 lumbar arteries and veins and filaments of the 

 sympathetic trunk. Laterally, above the crest 

 of the ilium, it is continuous with the fascia 

 covering .the front of the Quadratus lumborum 

 (see page 419), while below the crest of the 

 ilium it is continuous with the fascia covering 

 the Iliacus. 



The portions investing the Iliacus (fascia iliaca; 

 iliac fascia} is connected, laterally to the whole 

 length of the inner lip of the iliac crest; and 

 medially, to the linea terminalis of the lesser 

 pelvis, where it is continuous with the peri- 

 osteum. At the iliopectineal eminence it re- 

 ceives the tendon of insertion of the Psoas 

 minor, when that muscle exists. Lateral to the 

 femoral vessels it is intimately connected to 

 the posterior margin of the inguinal ligament, 

 and is continuous w r ith the transversalis fascia. 

 Immediately lateral to the femoral vessels the 

 iliac fascia is prolonged backward and medial- 

 ward from the inguinal ligament as a band, 

 the iliopectineal fascia, which is attached to 

 the iliopectineal eminence. This fascia divides 

 the space between the inguinal ligament and 

 the hip bone into two lacunae or compart- 

 ments, the medial of which transmits the 

 femoral vessels, the lateral the Psoas major 

 and Iliacus and the femoral nerve. Medial 

 to the vessels the iliac fascia is attached to 

 the pectineal line behind the inguinal apo- 

 neurotic f alx, w r here it is again continuous with 

 the transversalis fascia. On the thigh the 

 fasciae of the Iliacus and Psoas form a single 

 sheet termed the iliopectineal fascia. Where 

 the external iliac vessels pass into the thigh, the 

 fascia descends behind them, forming the pos- 

 terior wall of the femoral sheath. The portion 

 of the iliopectineal fascia which passes behind 



