Ala of sacrum

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Ala of sacrum
Base of sacrum seen from above (ala labeled at center left)
Latin Ala ossis sacri
Gray's p.108
TA A02.2.05.004
FMA 32439
Anatomical terminology

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. Additionally ala also forms the base of the lumbosacral triangle.

Structures Attached to Ala:

Structures in relation:


This article incorporates text from a public domain edition of Gray's Anatomy.

External links[edit]

  • pelvis at The Anatomy Lesson by Wesley Norman (Georgetown University)