Textbook Question
The structure that stabilizes the shoulder joint is known as the:
a. Rotator cuff.
b. Radial collateral ligament.
c. Posterior cruciate ligament.
d. Fibular collateral ligament.
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8. Joints
Joint Movements
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What are the primary movements that occur at the knee joint?
A
Abduction and adduction
B
Rotation and circumduction
C
Elevation and depression
D
Flexion and extension
Verified step by step guidance1
Understand the anatomy of the knee joint: The knee joint is a hinge joint formed by the articulation of the femur (thigh bone) and the tibia (shin bone), with the patella (kneecap) sitting in front.
Identify the type of joint: The knee is primarily a hinge joint, which allows movement in one plane, similar to the opening and closing of a door.
Recognize the primary movements of hinge joints: Hinge joints typically allow for flexion and extension. Flexion refers to bending the joint, decreasing the angle between the bones, while extension refers to straightening the joint, increasing the angle.
Differentiate from other movements: Abduction and adduction, rotation and circumduction, and elevation and depression are movements associated with other types of joints, such as ball-and-socket joints or pivot joints, not hinge joints like the knee.
Conclude with the correct movements: Therefore, the primary movements that occur at the knee joint are flexion and extension, as these are characteristic of hinge joints.
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