What is the primary function of the AC ligament?

• A. To connect the acromion to the clavicle
• B. To maintain articulation
• C. To limit the movement of the shoulder joint
• D. To stabilize the scapula and humerus

Answer: (B)

The primary function of the AC ligament, which is also known as the acromioclavicular ligament, is to maintain articulation between the acromion of the scapula and the clavicle. This ligament plays a crucial role in the functioning and stability of the shoulder girdle by connecting these two bones, allowing for proper movement and alignment during shoulder activities. By keeping the joint properly aligned, the AC ligament helps to facilitate a range of shoulder movements while preventing excessive motion that could lead to dislocation or injury.

In addition, the AC ligament supports the overall stability of the shoulder area, contributing to the integrity of the acromioclavicular joint during various motions, but its primary role remains focused on maintaining the articulation between these two critical components of the shoulder girdle.