150 MUSCULAR SYSTEM. 



Attachments. — Internally, to the supero-posterior part of the 

 ischium; externally, to the root of the trochanter major. 



Relations. — Posteriorly, with the biceps and obturator in- 

 ternus ; superiorly, with the gluteus internus ; inferiorly, with 

 the obturator externus ; anteriorly, with the hip jonit. The 

 sciatic nerve crosses this and the other muscles entering the 

 trochanterian hollow. 



Structure. — This is a pale delicate muscle, tendinous as well 

 as fleshy at its attachments : in the middle, fleshy altogether. 



3.— ANTERIOR ILIO-FEMORAL REGION. 

 The muscles in this region form the fore and prominent part of 

 the haunch. 



TENSOR VAGINA. — Ilio-aponeuroticns. 



Situation. — Antero-external part of the haunch. 



Figure. — Broad ; triangular ; flattened. 



Attachments. — Superiorly, to the anterior spine of the ileum : 

 inferiorly, to the faschia lata. 



Relations. — Anteriorly and externally, with the skin ; inter- 

 nally, with the posterior end of the panniculus, with the adipose 

 matter enveloped in the flank, and with the iliacus, rectus and 

 vastus externus ; posteriorly, with the glutei-maximus et ex- 

 ternus. 



Structure. — Tendinous and fleshy at its superior attachment, 

 from which it expands into a broad fleshy belly. About midway 

 between the pelvis and stifle, it sends off" a thin expansion of 

 tendon, which becomes continued into and confounded with the 

 faschia lata, largely contributing to it. 



Action. — To draw up and render tense the faschia lata ; 

 through whose interposition and connexion it will also aid in the 

 advancement and elevation of the haunch, and seemingly in the 

 extension of the thigh. 



RECTUS . — Ilio-rotuleus. 



Situation. — Forming the anterior prominence of the haunch. 



form. — Elongated ; cylindroid; fusiform; broader and thicker 

 in the middle than at either extremity. 



Attachments. — Superiorly and anteriorly, to the dorsum of the 

 ileum, above and rather in front of the acetabulum : inferiorly 

 and posteriorly, to the supero-anterior part of the patella. 



Relations. — Its upper part lies between the iliacus and tensor 

 vaginse. The body of the muscle is bounded laterally by the 

 two vasti ; posteriorly, by the femoral bone ; and anteriorly, by the 



