Proximal Upper Extremity and Shoulder Complex Articulation Quiz

Upper Extremity Joint Movement

• The glenohumeral joint facilitates a wide range of movement for the upper extremity, including rotation, flexion, and extension.
• This ball-and-socket joint allows movements in multiple planes, making it one of the most mobile joints in the body.

Clavicle and Scapula

• The acromioclavicular joint restricts clavicle movement and limits scapula mobility, providing stability at the shoulder region.
• This joint connects the lateral end of the clavicle to the acromion of the scapula, allowing limited movement in comparison to the glenohumeral joint.

Glenohumeral Joint Movements

• The glenohumeral joint can perform a total of seven distinct movements, including abduction, adduction, flexion, extension, internal rotation, external rotation, and circumduction.
• This wide range of motion is essential for various activities involving the shoulder.

Location of the Acromioclavicular Joint

• Situated at the lateral end of the clavicle, the acromioclavicular joint meets with the acromion of the scapula, forming a critical point of articulation in the shoulder girdle.

Upper Extremity Flexion and Extension

• The humeroulnar joint primarily facilitates flexion and extension of the upper extremity, specifically at the elbow.
• This hinge joint allows the arm to bend and straighten, essential for various daily activities.