Origin Inferior margin of pubic symphysis, inferior ramus of pubis, and adjacent ramus of ischium Insertion Medial surface of tibial shaft, just posterior to sartorius Action Flexes the knee, adducts the thigh, and helps to medially rotate the tibia on the femur Innervation Anterior division of obturator nerve (L2, L3) Arterial Supply Obturator artery, medial circumflex femoral artery, and muscular branches of profunda femoris artery