Lateral Abduction of the Arm

The action of lifting an arm can seem like a thoughtless movement, however, there is complex and intricate process that goes on within the human body to make that small movement happen. It involves bones, muscles, and nerves to complete this process, but it would not be able to start without a certain subconscious thought beforehand. Lateral abduction of the arm is defined as raising the humerus, radius, and ulna bones to ninety degrees, parallel to the ground, with the elbow extended, and wrist and fingers locked in place. Lateral Abduction of the Arm Extension of Humeroulnar and Radioulnar Joints The bones involved in this movement are all the bones of the shoulder and arm, all of these bones are connected and without all of them working together they would not be able to complete this movement. The Pectoral Girdle, which is the basis of the shoulder joint, is connected to the axial skeleton by the sternoclavicular joint. It also holds the clavicle, which is connected to the axial skeleton, the scapula, which stabilizes the shoulder and the humerus together. However, the humerus is also connected to the scapula at the glenohumeral joint, which is a ball and socket joint, and allows the movement of the shoulder. The humerus is then connected to the humeroulnar and Radiohumeral joints, known as the elbow joint, where the trochlear notch fits into the olecranon fossa of the humerus. Moving farther down the arm, the ulna is connected to the humerus at the humeroulnar joint, and the radius right next to it is connected to the ulna at the proximal radioulnar joint. The biaxial joint, is the last part of the arm that works in lateral abduction, it is connected to the radius at the distal articular surface. The Intercarpal joints, between the proximal and distal row of carpals, are what help contribute to wrist movement.

Glenohumeral Joint Humerus (red), Scapula (blue), Clavicle (purple) Though, the bones would not be able to move if it