The main function of the scapulothoracic articulation is to center the socket part of the shoulder joint to the ball of the arm during elevation of the arm. It also adds range to the arm when reaching overhead.
What are Scapulothoracic movements?
Upward rotation of the scapula on the thorax is the primary motion of the scapula observed during active elevation of the arm and plays a significant role in increasing the range of elevation of the arm overhead. This motion places the glenoid fossa in a position to support and stabilize the head of the raised humerus.
What bones make up the scapulothoracic joint?
The scapulothoracic joint (where the scapula meets with the ribs at the back of the chest)
Is Scapulothoracic a ball and socket joint?
The shoulder joint or Shoulder complex is unlike other joints of the body as it is comprised of 4 articulations: Glenohumeral Joint (ball and socket), Scapulothoracic Joint,Sternoclavicular joint and the Acromioclavicular Joint.
Why is the scapulothoracic joint?
The scapulothoracic joint allows for the complex scapular movements in relation to the thoracic cage: elevation and depression, protraction and retraction, and medial and lateral rotation.
What is unique about the Scapulothoracic articulation?
It is attached to the axial skeleton through the acromioclavicular joint and the sternoclavicular joint. The scapulothoracic articulation allows increased shoulder elevation. For every 2º of glenohumeral elevation, there is 1º of scapulothoracic elevation.
What is Scapulothoracic rhythm?
Terminology. Scapulohumeral rhythm: the coordinated motion of the scapula and humerus experienced during shoulder movement and motion that has been traditionally viewed as occurring at a ratio of 2:1 (2 degrees of humeral flexion/abduction to 1 degree of scapular upward rotation).
What is the scapulothoracic joint quizlet?
scapulothoracic joint. refers to movement of the scapula relative to the rib cage. motions of the scapula. allow increased ROM at the shoulder by reorienting the glenoid fossa.
What controls the scapulothoracic joint?
Scapular stability
Since it has no ligaments, the scapulothoracic junction is stabilized by the synchronized actions and passive tensions of the three functional muscle units; The trapezius muscle. The serratus anterior muscle. The medial stabilizers of the scapula; levator scapulae and rhomboid muscles.
What does scapular winging indicate?
The term ‘winged scapula’ (also scapula alata) is used when the muscles of the scapula are too weak or paralyzed, resulting in a limited ability to stabilize the scapula. As a result, the medial or lateral borders of the scapula protrudes from back, like wings.
What are the 4 joints in the shoulder?
The shoulder girdle is composed of the clavicle and the scapula, which articulates with the proximal humerus of the upper limb. Four joints are present in the shoulder: the sternoclavicular (SC), acromioclavicular (AC), and scapulothoracic joints, and glenohumeral joint.
What plane of motion is scapular depression?
Movement of the Scapula
Four movements of the scapula occur in the frontal plane: elevation – associated with reaching when glenohumeral abduction and flexion are limited in range. depression – associated as a closed-chain motion with crutch walking, transfers, and use of a walker.
