Which nerve innervates the pectinius muscle?

• A. Femoral nerve
• B. Obturator nerve
• C. Sciatic nerve
• D. Peroneal nerve

Answer: (B)

The pectineus muscle is primarily innervated by the femoral nerve. This muscle, located in the anterior compartment of the thigh, plays a key role in hip flexion and adduction. The innervation from the femoral nerve allows for the fine motor control needed for these movements.

While the obturator nerve also supplies some fibers to the pectineus muscle in a small percentage of cases, it is the femoral nerve that is predominantly responsible for its innervation, accounting for the majority of instances. Understanding this distinction is crucial for grasping how muscular control is coordinated in the hip region and the variations in nerve supply among individuals.

The sciatic and peroneal nerves are not involved in the innervation of the pectineus muscle, as they primarily serve other muscle groups in the leg and foot.