What is the insertion of this highlighted muscle?
The Correct Answer and Explanation is:
Correct Answer:
Insertion of the gluteus medius: Greater trochanter of the femur
Explanation
The gluteus medius is a thick, fan-shaped muscle located on the outer surface of the pelvis. It is one of the primary muscles of the gluteal region, situated between the gluteus maximus and the gluteus minimus. In the provided image, the highlighted region corresponds to the anatomical position and shape of the gluteus medius on the lateral aspect of the hip.
Origin and Insertion
- Origin: Outer surface of the ilium, between the anterior and posterior gluteal lines.
- Insertion: Lateral surface of the greater trochanter of the femur.
The greater trochanter is a prominent bony protrusion on the proximal (upper) part of the femur. It serves as the insertion point for several hip-stabilizing muscles, including the gluteus medius.
Function
The gluteus medius plays a critical role in the abduction of the thigh at the hip joint and stabilization of the pelvis during gait. When walking, especially during the stance phase (when one foot is on the ground), the gluteus medius on that side contracts to prevent the opposite side of the pelvis from dropping. This action maintains pelvic balance and keeps gait steady.
Weakness or damage to the gluteus medius can result in a Trendelenburg gait, characterized by a dropping of the pelvis on the opposite side during walking.
Clinical Relevance
Understanding the insertion of the gluteus medius is important for clinicians, especially in orthopedic surgery, physical therapy, and the diagnosis of hip pathologies. Improper intramuscular injections in the gluteal region can damage this muscle or the nearby sciatic nerve.
In summary, the highlighted gluteus medius muscle inserts on the greater trochanter of the femur and is essential for hip abduction and pelvic stability during movement.
