Hip Bone

Ilium

Large, superior portion of the hip bone.

Ala

Broad, wing-shaped part of the ilium.

Iliac crest

Superior curved border of the ilium.

Iliac fossa

Large, smooth depression on the medial ilium.

Anterior superior iliac spine (ASIS)

Upper anterior projection of the ilium.

Anterior inferior iliac spine (AIIS)

Lower anterior projection below the ASIS.

Posterior superior iliac spine (PSIS)

Upper posterior projection of the ilium.

Posterior inferior iliac spine (PIIS)

Lower posterior projection below the PSIS.

Anterior gluteal line

Ridge on lateral ilium for gluteal muscle attachment.

Posterior gluteal line

Posterior ridge for gluteal muscle attachment.

Inferior gluteal line

Lower ridge for gluteal muscle attachment.

Arcuate line

Curved ridge on the medial ilium forming part of the pelvic brim.

Auricular surface

Ear-shaped surface that articulates with the sacrum.

Ischium

Posterior-inferior portion of the hip bone.

Body of ischium

Thick portion of the ischium near the acetabulum.

Ischial spine

Pointed projection between the sciatic notches.

Ischial tuberosity

Large rough area that bears weight when sitting.

Ramus of ischium

Branch of ischium that joins the pubis.

Greater sciatic notch

Large notch superior to the ischial spine.

Lesser sciatic notch

Smaller notch inferior to the ischial spine.

Pubis

Anterior portion of the hip bone.

Body of pubis

Central portion of the pubis.

Superior pubic ramus

Upper branch extending from the pubis.

Inferior pubic ramus

Lower branch that joins the ischium.

Pubic crest

Ridge along the superior body of the pubis.

Pubic tubercle

Small projection on the pubis for ligament attachment.

Pectineal line

Ridge on the superior pubic ramus.

Symphysial surface

Surface where the left and right pubic bones join.

Acetabulum

Cup-shaped socket that receives the head of the femur.

Lunate surface

Smooth, C-shaped articular surface inside the acetabulum.

Obturator foramen

Large opening formed by the pubis and ischium.