Ala ilii, also known as iliac wings, refers to the broad, flat, and fan-shaped bony structures located on each side of the pelvis, extending from the iliac crest to the sacrum. The iliac wings are one of the major components of the pelvic girdle, along with the pubic bones and the sacrum. These wings form the upper lateral portions of the pelvis, serving as attachment points for various muscles and ligaments.
The primary function of the ala ilii is to provide support and stability for the lower abdomen and pelvic area, connecting the vertebral column to the lower limbs. These large, wing-like structures help distribute and transmit the weight of the upper body through the pelvis to the lower limbs during weight-bearing activities such as walking, running, and jumping.
In addition to their structural function, the iliac wings also play a significant role in protecting vital organs within the pelvic cavity, such as the bladder and reproductive organs. Due to their size and shape, they provide a protective barrier, reducing the risk of injury during physical activities or trauma.
Furthermore, the iliac wings accommodate various muscle attachments, allowing for the movement and support of the lower extremities. Muscles that attach to the iliac wings include the gluteus maximus, gluteus medius, and the lower fibers of the abdominal muscles.
Overall, the ala ilii or iliac wings are crucial components of the pelvic girdle, providing support, stability, protection, and serving as important attachment sites for multiple muscles and ligaments involved in lower limb movement.
