M. Psoas (M. iliacus), [Figs. 13], [15], [18]
T. pallidicinctus
General Description and Relations.—Small and slender; on medial aspect of proximal end of thigh lateral to proximal end of M. ambiens; ventromedial to M. iliotrochantericus medius; proximal end visible from inside pelvis (medial to inguinal ligament); passes dorsolateral to inguinal ligament.
Origin.—The muscle arises fleshily from the ventrolateral edge of the ilium posterior to the femoral notch and ventral (adjacent) to the origin of M. iliotrochantericus medius.
Insertion.—The attachment is tendinous to the medial surface of the femur a short distance proximal to the origin of M. femoritibialis internus.
Innervation.—The posterior division of the femoral nerve, which spirals completely around M. psoas, gives several twigs into the proximal part.
Individual Variation.—None of significance.
T. cupido
Individual Variation.—In two legs the insertion is partly fleshy.
P. p. jamesi