Pectineus Muscle. Origin: The pectineus muscle originates from the superior pubic ramus, adjacent fascia. Insertion: The fibres of the pectineus muscle travel inferolaterally and insert, via a broad tendon, onto the pectineal line of the femur. The pectineus muscle is found in the medial compartment of the thigh; however due to its innervation and actions, it can also be considered a muscle of the anterior compartment of the thigh. It is a short flat quadrilateral type of skeletal muscle. #anato