Which muscles are involved in Scapulohumeral rhythm?
Which muscles are involved in Scapulohumeral rhythm?
Latissimus Dorsi and m. Levator Scapulae, shortening of the posterior joint capsule and/or lack of coordination between essential muscles like the m. Serratus Anterior, m. Trapezius and Rotator cuff muscles.
What muscle causes scapular retraction?
The muscles involved in scapular retraction are the upper trapezius, middle and lower trapezius, rhomboids, and latissimus dorsi.
What happens during Scapulohumeral 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 muscles upwardly rotate the scapula?
Upward rotation is accomplished by the trapezius and serratus anterior muscles. Downward rotation is accomplished by the force of gravity as well as the latissimus dorsi, levator scapulae, rhomboids, and the pectoralis major and minor muscles.
What is reverse Scapulohumeral rhythm?
Reverse Scapulohumeral Rhythm RTSA is a surgical procedure used to address rotator cuff tears and various conditions which involve the dysfunction of the rotator cuff. Typically, individuals who have undergone an RTSA will have changes in scapular position and show more upward rotation of the scapula.
What does the supraspinatus muscle do?
The supraspinatus muscle functions to initiate abduction and depress the humeral head against the upward pull of the deltoid. The muscle and tendon travel slightly obliquely from posterior to anterior, allowing it to contribute to external rotation as well.
Which muscle retracts rotates and fixes the scapula?
Rhomboid major indicated in red. Retracts the scapula and rotates it to depress the glenoid cavity. It also fixes the scapula to the thoracic wall.
What happens when the levator scapulae contracts?
If the scapula is fixed, a contraction of the levator scapulae leads to the lateral flexion of the cervical vertebral column to the side and stabilizes the vertebral column during rotation.
What is Scapulohumeral rhythm and why is it important?
Scapulohumeral rhythm (also referred to as glenohumeral rhythm) is the kinematic interaction between the scapula and the humerus, first published by Codman in the 1930s. This interaction is important for the optimal function of the shoulder.
Where is the infraspinatus muscle?
shoulder
Your infraspinatus muscle is a thick triangular muscle located at the back of your shoulder. It’s attached to the top of your upper arm bone (humerus) and your shoulder blade (scapula). The other rotator cuff muscles are the supraspinatus, subscapularis, and the teres minor.
What does the subscapularis muscle do?
The subscapularis muscle originates at the subscapular fossa and inserts into the lesser tubercle of the humerus. The muscle internally rotates and adducts the humerus.