Pectineus Muscle, Anterior View

Description

Running along the superior medial thigh, the pectineus appears as a flat, quadrilateral muscle spanning from the pecten pubis and superior ramus of the pubis to the proximal femur at the pectineal line, just inferior to the lesser trochanter. Its fibers course inferolaterally, sitting medial to iliopsoas and deep to the expected plane of sartorius and the femoral neurovascular bundle in the femoral triangle. Superiorly, the muscle hugs the pubic margin near the acetabulum, while its distal attachment blends into the medial aspect of the femoral shaft. Clear bony landmarks anchor the relationships. Clinically, pectineus is an easy muscle to mislabel because it straddles the functional boundary between anterior compartment flexors and medial compartment adductors, and its dual innervation pattern often comes up in teaching. Femoral nerve supply predominates, but an accessory obturator nerve or obturator contribution is a common variant, which matters when correlating groin pain or adductor weakness with regional nerve blocks. Strain at the pubic origin can mimic adductor longus tendinopathy in athletes, and the proximal femoral attachment helps explain pain referral toward the hip joint during resisted flexion and adduction. Small muscle, frequent confusion. Use this anterior view when you need a clean reference for femoral triangle floor anatomy, hip adductor compartment orientation, or proximal femur attachment sites in an undergraduate gross anatomy lab manual. It also fits orthopedic and sports medicine content on athletic groin injuries, and anesthesiology education discussing femoral versus obturator nerve involvement around the pubis and proximal femur. Anatomical accuracy verified by SciePro's Medical Advisory Board.