Question

The cup-shaped cavity for the articulation of the head of the femur is called (a) Glenoid cavity (b) Acetabulum (c) Obturator (d) Sigmoid notch

Short answer

The correct answer is (b) Acetabulum. The Acetabulum is the cup-shaped cavity in the hip bone where the head of the femur articulates.

Step-by-step solution

Understanding the Question

The question is asking for the name of the cup-shaped cavity in which the head of the femur, which is the bone in the upper part of the leg, articulates or connects.

Reviewing the Options

Review all the provided options which are (a) Glenoid cavity (b) Acetabulum (c) Obturator (d) Sigmoid notch. From these options, one needs to select the term correctly defining the mentioned structure.

Selecting the Right Answer

The right answer is (b) Acetabulum. The Acetabulum is the cup-shaped cavity in the hip bone, in which the head of the femur articulates.

Key concepts

Femur

The femur is the largest and strongest bone in the human body. It is often referred to as the thigh bone and it plays a crucial role in supporting the weight of the upper body. The femur is essential in facilitating movement by connecting the hip bone to the knee.

• Structure: The femur features a long shaft, with a rounded head at the top. It fits into the hip joint via the acetabulum.
• Function: It not only supports movement but also provides support when standing, walking, and running.
• Importance: A well-functioning femur is critical for overall mobility. Its robust structure allows for powerful movements like jumping and running.

Hip joint

The hip joint is a ball-and-socket joint that allows for a wide range of motion. This joint is essential for various activities, such as walking, sitting, and more intense physical exertion.

• Components: It is formed by the head of the femur fitting into the acetabulum of the pelvis.
• Function: This joint allows for stability and balance, which are essential for performing daily activities.
• Range of Motion: Thanks to its ball-and-socket structure, the hip joint allows more flexibility in movement compared to other types of joints.

Understanding the hip joint helps in recognizing how important joint health is for maintaining overall physical fitness and functionality.

Articulation

Articulation refers to the point where two or more bones meet, allowing for movement and flexibility. In the case of the hip joint, articulation refers to how the femur and the acetabulum connect.

• Role in Movement: This connection is what permits the dynamic motions of the leg, such as bending, rotating, and supporting the body's weight.
• Types of Articulation: Articulations can be classified based on the movement they allow, with the hip joint being a prime example of a synovial joint that provides extensive range of movement.
• Importance: Proper articulation is critical for fluid movement and stability. Disruptions in articulation can lead to discomfort and decreased mobility.

Having a robust understanding of articulation helps in identifying the significance of joint health in everyday activities.