Ala of Sacrum
Ala of Sacrum - Definition
The "Ala of Sacrum" refers to the upper surface of the lateral sacral section lying adjacent to the body. It is also referred to by other names like:
Ala ossis sacri (Latin)
Wing of sacrum
It must be remembered that the word "Ala" is actually Latin in origin and stands for "wing."
Ala of Sacrum - Anatomy and Appearance
This structure develops from the fusion of the costal and the transverse processes of the sacrum. These wings are wide in the superior part of the anteroposterior plane and become narrower inferiorly.
Ala of Sacrum - Functions
They are responsible for creating the auricular surface laterally (which is covered by hyaline cartilage) which, along with the os coxae, forms the synovial joints. It supports the Psoas major, acts as part of the pelvic brim border and also creates the base of the lumbosacral triangle.
It also serves as a site of attachment for the following structures:
Ala of Sacrum - Pictures
The images below would help you get an idea about the location and appearance of this skeletal structure.
Back to Skeletal System