The epiphysis of the femur articulates with the pelvis at the (a) pubic symphysis, (b) acetabulum, (c) sciatic notch, (d) obturator foramen.

Verified step by step guidance

Step 1: Understand the anatomy involved. The femur is the thigh bone, and its epiphysis refers to the rounded end of the bone that participates in a joint.

Step 2: Identify the pelvic structures listed: the pubic symphysis is a cartilaginous joint between the two pubic bones; the acetabulum is a deep, cup-shaped cavity on the pelvis; the sciatic notch is a large indentation on the pelvis; and the obturator foramen is a large opening in the pelvis.

Step 3: Recall that the femur's head (part of the epiphysis) fits into a socket on the pelvis to form the hip joint, which allows for a wide range of motion.

Step 4: Recognize that the socket on the pelvis that articulates with the femur is called the acetabulum, which forms the ball-and-socket joint of the hip.

Step 5: Conclude that the epiphysis of the femur articulates with the pelvis at the acetabulum.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Epiphysis of the Femur

The epiphysis refers to the rounded end part of a long bone, which in the femur is involved in forming joints. The proximal epiphysis of the femur includes the head, which fits into a socket to form the hip joint.

Acetabulum

The acetabulum is a deep, cup-shaped cavity on the lateral aspect of the pelvis. It serves as the socket for the femoral head, forming the ball-and-socket hip joint, allowing for a wide range of motion.

Pelvic Landmarks and Articulations

The pelvis has several key landmarks: the pubic symphysis is a midline cartilaginous joint, the sciatic notch is a bony indentation, and the obturator foramen is a large opening. None of these directly articulate with the femur except the acetabulum.

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