ANATOMY IN A NUTSHELL. 135 



Origin: — (Plate LXXIII.) Sides of bodies of last dorsal and first Lumbar 

 vertebra? and substance between. 



Insertion: — (Plate XLIV.) Ilio-pectineal eminence and by its outer 

 border into the iliac fascia. 



Action: — Same as Psoas magnus, also makes tense the iliac fascia. 



Nerve Supply: — Anterior branch of first lumbar. 



Blood Supply: — Lumbar from abdominal aorta. 



Iliacus. — Description. — (Plate LXXIII.) The Iliacus and the Psoas 

 magnus are sometimes regarded as one muscle, the Ilio-psoas, since they have 

 one insertion. The Iliacus which is flat and triangular fills the whole of the 

 iliac fossa. 



Origin. — (Plates XLIV-XLVL) — (1) Upper two-thirds of iliac fossa and 

 inner margin of crest of ilium; (2) in front, anterior superior and inferior spin- 

 ous process of ilium and notch between: (.'->) behind, ilio-lumbar ligament and 

 base of sacrum; (4) fibers from capsule of hip-joint. 



Insertion. — (Plate XLVIII.) — Outer side of tendon of Psoas muscle and 

 into oblique line extending from lesser trochanter to linea aspera. 



Action. — Flexes thigh on pelvis and rotates femur outward; also aids in 

 maintaining erect posture. 



Nerve Supply. — Anterior branches of second and third lumbar through 

 the anterior crural. 



Blood Supply. — Ilio-lumbar. 



Tensor vagina 3 femoris. — Description. — (Plate LXIV.) — This muscle lies 

 along the outer side of the thigh and extends from the crest of the ilium to about 

 one-fourth the distance to the knee. 



Origin. — (Plate XLIII.) — Anterior portion of outer lip of crest of ilium 

 and outer surface of anterior superior spinous process between Gluteus medius 

 and Sartorius muscle, and from fascia covering the Gluteus medius. 



Insertion. — (Plate LXIV.) — Between the two layers of the fascia lata. 

 The fascia is continued downward to external tuberosity of the tibia as a thick- 

 ened band, the ilio-tibial band. 



Action. — Tenses fascia lata. 



Nerve Supply. — Fourth and fifth lumbar and first sacral through the 

 superior gluteal. 



Blood Supply. — Superior gluteal and external circumflex. 



Sartorius. — Description. — (Plate LXXIY.) — This muscle, which extends 

 from the ilium to the tibia, is flat, narrow, ribbon-like, and i< the longest one in 

 the body. In the upper part of its course it forms the outer boundary of Scar- 

 pa's triangle. It passes downward, then obliquely inward, then downward to 

 the insertion. 



Scarpa's triangle (Plates LXIV-LXXIV.) — Is bounded above by Pouparl 'a 

 ligament. On the outer side by the Sartorius and on its inner side by the Ad- 

 ductor longus. The femoral vessels and the anterior crural nerve pass through 

 it- center from above down. Their position from within outward is femoral 

 vein, artery, and anterior crural nerve (V. A. N.). The floor of this triangle from 

 without inward is formed by the Iliacus, Psoas, IVctineus, (Adductor brevis?) 



