Auricular surface of ilium
Facies auricularis ossis ilium
- Related terms: Auricular surface
Definition
The auricular surface of ilium is a component of the sacropelvic surface of the iliac region of the hip bone. It is situated anteriorly and inferiorly to the thickened iliac tuberosity at the posterior aspect of the ilium.
To provide some context, it is important to note that the arcuate line is an oblique ridge located on the inner or medial surface of the ilium. Due to its oblique course, it divides the ilium into an anterosuperior and a posteroinferior part, with the latter referred to as the sacropelvic surface. The sacropelvic surface of the ilium consists of three sub-parts: 1) a thickened iliac tuberosity above, and 2) a pelvic surface below, and 3) an auricular surface of ilium positioned between the first two sub-parts. The auricular surface is situated in front of and below the iliac tuberosity and articulates with the sacrum at the sacroiliac joint.
The auricular surface of ilium serves as an attachment site for the ventral sacroiliac ligament along its convex margin.
References
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Text written by Muhammad A. Javaid, MD, PhD © 2023 IMAIOS.
Drake, R.L., Vogl, A.W. and Mitchell, A.W.M. (2009). ‘Chapter 5: Pelvis and Perineum’ in Gray’s anatomy for Students. (2nd ed.) Philadelphia PA 19103-2899: Elsevier, pp.421-424.
Standring, S. and Gray, H. (2016). ‘Chapter 80: Pelvic girdle, gluteal region and thigh’ in Gray’s anatomy The anatomical Basis of Clinical Practice. (41st ed.) New York: Elsevier, pp. 1339-1344.
