What portion of the ilium extends from the ASIS to the PSIS?

What portion of the ilium extends from the ASIS to the PSIS?

• A. Iliac notch
• B. Iliac crest
• C. Iliac fossa
• D. Ischial tuberosity

Answer: (B)

The iliac crest is the superior border of the ilium and extends from the anterior superior iliac spine (ASIS) to the posterior superior iliac spine (PSIS). This bony ridge provides important landmarks for both anatomy and various clinical and radiographic assessments. It serves as an attachment point for muscles and ligaments of the abdomen and back, contributing to stability and movement of the pelvis.

In contrast, other options do not accurately represent the area between the ASIS and PSIS. The iliac notch is a curved indentation located on the medial aspect of the ilium and does not span the distance between these two prominent bony landmarks. The iliac fossa refers to the concave surface of the ilium, primarily serving as a site for muscle attachment, without extending from ASIS to PSIS. The ischial tuberosity is located on the ischium, not the ilium, and serves as an attachment point for muscles; it is not associated with the specified measurement between the ASIS and PSIS. Thus, the iliac crest is the correct answer due to its direct anatomical significance in this context.