Table of Contents
What is scapula lateral rotation?
In the sagittal plane, around a latero-lateral axis the scapula rotates posteriorly (posterior tilting) or anteriorly (anterior tilting). The scapula on the thorax contributes to elevation (flexion and abduction) of the humerus by upwardly rotating the glenoid fossa 50° to 60° from its resting position.
What rotates the scapula upward?
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.
Is shoulder lateral rotation the same as external rotation?
Lateral rotation Keeping your elbows against your body swing your forearms away from your body. This is lateral rotation — also referred to as external rotation — and the normal range of motion for a healthy shoulder is 90 degrees.
Can you move scapula?
The scapulae can move in six directions and each movement is produced by specific, primary muscles….Categories.
| Action of the Scapula | What the Action Looks Like (Try It Yourself) | Primary Muscles |
|---|---|---|
| Downward rotation | Return the arms downward from the overhead | Rhomboids |
What is protraction of scapula?
During protraction, the scapulae move away from the spine as you round the upper back (thoracic spine). You protract by pushing your shoulders forward and spreading your scapulae across your back, trying to touch them in front of your chest. Retracting is done by squeezing the shoulder blades together.
What muscles are responsible for lateral rotation of the humerus?
The infraspinatus and teres minor both aid in lateral, or external, rotation of the arm at the shoulder.
What does it mean to rotate the scapula inferiorly?
Downward rotation is the opposite of upward rotation. Your scapulae downwardly rotate when you bring your arms down from an overhead position or when you go to reach your hand into your back pocket. During this motion, the inferior angle of the scapula moves closer to the spine. Elevation.
What drives upward rotation of the scapula?
Forces drive all movements. In this case, muscles that rotate the scapula upward include the serratus anterior (SA) and parts of the trapezius . During the early phase of upward rotation, the scapula and the clavicle move together around an axis through the sternoclavicular (SC) joint, the only joint where the scapula and shoulder girdle attach to the axial skeleton.
What are muscles upwardly rotate the scapula?
The serratus anterior muscle abducts and upwardly (laterally) rotates the scapula and holds the scapula flat against the rib cage.
What are muscles cause medial rotation of the scapular?
The third group, which is mainly responsible for stabilization and rotation of the scapula, consists of the trapezius, serratus anterior, levator scapulae , and rhomboid muscles. These attach to the medial, superior, and inferior borders of the scapula.
What muscles attach to the posterior surface of the scapula?
The scapula is a flat, triangular-shaped bone that lies adjacent to the posterior surface of ribs. Seventeen muscles attach to the scapula, and it articulates with the clavicle to form the shoulder girdle or pectoral girdle , which supports movements of the humerus.