Gluteus medius is supplied by –
**Core Concept**
The gluteus medius muscle is a key component of the hip abductors, responsible for stabilizing the pelvis and facilitating movement of the lower limb. It is innervated by a specific nerve branch that arises from the lumbosacral plexus, which is a complex network of nerves that originate from the lumbar and sacral spinal cord segments.
**Why the Correct Answer is Right**
The gluteus medius muscle is supplied by the superior gluteal nerve, which is a branch of the L4-S1 nerve roots. This nerve originates from the lumbosacral plexus and travels through the greater sciatic foramen to innervate the gluteus medius and minimus muscles. The superior gluteal nerve is responsible for controlling the motor function of these muscles, allowing for hip abduction and pelvic stabilization.
**Why Each Wrong Option is Incorrect**
**Option A:** The inferior gluteal nerve is primarily responsible for innervating the gluteus maximus muscle, not the gluteus medius.
**Option B:** The pudendal nerve is a branch of the S2-S4 nerve roots, primarily involved in controlling the pelvic floor muscles.
**Option C:** The obturator nerve is a branch of the L2-L4 nerve roots, primarily responsible for innervating the adductor muscles of the thigh.
**Clinical Pearl / High-Yield Fact**
The gluteus medius muscle plays a crucial role in maintaining pelvic stability, particularly in single-leg stance or weight-bearing activities. Weakness or paralysis of this muscle can lead to a characteristic Trendelenburg gait, where the pelvis drops on the opposite side of the stance leg.
**Correct Answer:** D.