Which part of the acetabulum forms its lower margin?

Which part of the acetabulum forms its lower margin?

• A. Acetabular Roof
• B. Acetabular Floor
• C. Pelvic Inlet
• D. Pubic Symphysis

Answer: (B)

The acetabulum is a cup-shaped socket with a defined rim, where the bottom interior surface forms its lower boundary. That interior bottom is the acetabular floor, which provides the lower margin of the socket and bears contact with the femoral head through the articular surface. The roof is the superior part of the socket, built mainly by the iliac portion, while the pelvic inlet and pubic symphysis are not part of the acetabular margins. So the lower margin is formed by the acetabular floor.

The acetabulum is a cup-shaped socket with a defined rim, where the bottom interior surface forms its lower boundary. That interior bottom is the acetabular floor, which provides the lower margin of the socket and bears contact with the femoral head through the articular surface. The roof is the superior part of the socket, built mainly by the iliac portion, while the pelvic inlet and pubic symphysis are not part of the acetabular margins. So the lower margin is formed by the acetabular floor.