Anterior superior iliac spine

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Anterior superior iliac spine
The obturator membrane. (Anterior superior iliac spine visible in upper left).
Location of McBurney's point (1), located two thirds the distance from the umbilicus (2) to the anterior superior iliac spine (3).
Latin spina iliaca anterior superior
Gray's subject #57 234

The anterior superior iliac spine (ASIS) is an important landmark of surface anatomy. It refers to the anterior extremity of the iliac crest of the pelvis, which provides attachment for the inguinal ligament and the sartorius muscle.

ASIS provides a clue in identifying some other clinical landmarks, including:

  1. McBurney's point
  2. Gardner's line
  3. Inguinal ligament

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Pelvis/pelvic cavity: sacrum, coccyx, hip bone
Ilium: Arcuate line - Wing - gluteal lines (Posterior, Anterior, Inferior) - Fossa - Tuberosity - Crest - iliac spines (Anterior superior - Anterior inferior - Posterior superior - Posterior inferior)

Ischium: Body (Ischial spine, Lesser sciatic notch) - Superior ramus (Tuberosity of the ischium) - Inferior ramus

Pubis: Superior ramus (Pubic tubercle, Pubic crest, Obturator crest) - Inferior ramus (Pectineal line)

Compound: Obturator foramen - Acetabulum - Acetabular notch - Greater sciatic notch - Iliopectineal eminence - Ischiopubic ramus - Pubic arch - Lesser pelvis (Pelvic inlet, Pelvic brim, Pelvic outlet) - Greater pelvis