Ala of sacrum
|Ala of sacrum|
|Base of sacrum. (Ala labeled at center left.)|
|Latin||ala ossis sacri|
|Gray's||subject #24 108|
On either side of the body of the base of the sacrum is a large triangular surface, which supports the Psoas major and the lumbosacral trunk, and in the articulated pelvis is continuous with the iliac fossa. This is called the ala.
It is slightly concave from side to side, convex from before backward, and gives attachment to a few of the fibers of the Iliacus.
The posterior fourth of the ala represents the transverse process, and its anterior three-fourths the costal process of the first sacral segment.
It serves as part of the border of the pelvic brim.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.