anatomy 8.3

What bones make up the adult pelvis?

Sacrum, coccyx, and the right and left hip bones (ossa coxae).

What bones make up the pelvic girdle?

The right and left hip bones only.

What is the difference between the pelvis and the pelvic girdle?

The pelvis includes the sacrum, coccyx, and hip bones; the pelvic girdle includes only the two hip bones.

What are the functions of the pelvis?

Protects and supports the pelvic organs (viscera).

Which bone of the thigh articulates with the pelvis?

Femur.

What part of the hip bone receives the head of the femur?

Acetabulum.

What is another name for the hip bone?

Os coxae (coxal bone or innominate bone).

What three bones fuse to form each hip bone?

Ilium, ischium, and pubis.

At what age do the ilium, ischium, and pubis usually fuse?

Between 13 and 15 years of age.

What joint connects the hip bone to the sacrum?

Sacroiliac joint.

What is the acetabulum?

A deep socket on the lateral side of the hip bone that articulates with the femur.

What part of the acetabulum articulates with the femoral head?

Lunate surface.

Which three bones contribute to the acetabulum?

Ilium, ischium, and pubis.

Which is the largest of the three hip bones?

Ilium.

Which region of the hip bone does the ilium form?

The superior region.

What is the ala of the ilium?

The broad, fan-shaped wing of the ilium.

What is the arcuate line?

A ridge on the medial surface of the ilium.

What is the iliac fossa?

A depression on the medial side of the ala.

What are the gluteal lines?

Muscle attachment sites on the lateral ilium.

Which muscles attach to the gluteal lines?

The gluteal muscles.

What is the auricular surface?

A roughened area where the ilium articulates with the sacrum.

What is the iliac crest?

The superior border (ridge) of the ilium.

Which two spines mark the ends of the iliac crest?

Anterior superior iliac spine (ASIS) and posterior superior iliac spine (PSIS).

Which spine lies below the ASIS?

Anterior inferior iliac spine (AIIS).

Which spine lies below the PSIS?

Posterior inferior iliac spine (PIIS).

What notch lies below the posterior inferior iliac spine?

Greater sciatic notch.

Which nerve passes through the greater sciatic notch?

Sciatic nerve.

Which hip bone forms the posterior two-fifths of the acetabulum?

Ischium.

What is the ischial spine?

A pointed projection posterior to the acetabulum.

What is the ischial body?

The bulky bone superior to the ischial spine.

What is the lesser sciatic notch?

A depression inferior to the ischial spine.

What is the ischial tuberosity?

A roughened projection that supports body weight while sitting.

What is another name for the ischial tuberosities?

Sitz bones.

What is the ischial ramus?

An extension from the ischial tuberosity that fuses with the pubis.

Which structure supports your body weight when you sit?

The ischial tuberosities.