Which nerve is responsible for innervating the obturator internus muscle?

The correct response highlights the importance of understanding the innervation of the obturator internus muscle. The obturator internus is primarily innervated by the nerve to the obturator internus, which is a branch of the sacral plexus. This specific nerve arises from the L5, S1, and S2 roots. Although the pudendal nerve is often associated with pelvic structures and is involved in the innervation of the external genitalia and pelvic floor muscles, it is not the direct source of innervation for the obturator internus itself.

When exploring the other options, the superior gluteal nerve is responsible for innervating the gluteus medius, gluteus minimus, and tensor fasciae latae muscles. The inferior gluteal nerve innervates the gluteus maximus, while the femoral nerve primarily innervates the quadriceps and flexors of the hip. Thus, neither of these nerves plays a role in innervating the obturator internus muscle.

In conclusion, understanding the anatomy and function of the obturator internus muscle, alongside its specific nerve supply, highlights the significance of the correct answer, which aligns with the known anatomical relationships in the pelvic region.