What causes depression of the scapula?
What causes depression of the scapula?
In most instances, depression of the scapula is a passive process (due to gravity) that is facilitated by movement at the acromioclavicular joint. Occasionally some muscular attachments serve as active depressors, the most commonly described being the inferior fibers of serratus anterior and pectoralis minor 1-3.
What is the primary mover for scapular depression?
The scapula is moved laterally and anteriorly along the chest wall. Muscles: serratus anterior is the prime mover. Pectoralis minor and major, the latter acting through the humerus, may assist (act as synergists). Retraction of the scapula is sometimes called adduction of the scapula.
Which muscles produce depression of the scapula on the thoracic wall?
However, pectoralis minor and the lowermost fibers of the serratus anterior muscle can actively depress the scapula, while the levator scapulae, rhomboids and pectoralis minor are active internal rotators.
What muscles protract and depress the scapula?
Pectoralis minor is a “fan” shaped muscle that assists in pulling the scapula anteriorly or “protracting” it, as well as depression of the shoulder.
Does serratus anterior depress the scapula?
This shifting now enables to lift the arm above 90° (elevation). In contrast, the superior part depresses the scapula and thus acts antagonistically. Another function of the serratus anterior is the active stabilization of the scapula within the shoulder.
What muscles rotate the scapula downward?
Categories
| Action of the Scapula | What the Action Looks Like (Try It Yourself) | Primary Muscles |
|---|---|---|
| Upward rotation | Lift the arms overhead; scapulae will follow and rotate upward | Upper and middle trapezius |
| Downward rotation | Return the arms downward from the overhead | Rhomboids |
How do you train scapular depression?
Gently squeeze your shoulder blades together, then slowly lift your arms so they are parallel to your body. Rotate arms out, bringing your thumbs up. Hold for 5 seconds, then lower your arms back down and repeat.
Which muscle of the pectoral girdle acts in depression and protracting the shoulder?
Pectoralis major is a superficial muscle of the pectoral region and has a sternal and clavicular part. The latissimus dorsi contributes to adduct and depress the scapula and shoulder complex with pectoralis major that adduct the shoulder.
Does the pec minor depress the scapula?
It is one of the anterior axioappendicular (thoracoappendicular) muscles, together with the pectoralis major, subclavius and serratus anterior….Pectoralis minor muscle.
| Origin | Anterior surface, costal cartilages of ribs 3-5 |
|---|---|
| Function | Scapulothoracic joint: draws scapula anteroinferiorly, stabilizes scapula on thoracic wall |
What muscle pulls scapula down?
The rhomboids are rhombus-shaped and are used to pull the shoulder blades together. They also rotate the scapula in a downward direction and provide stability for your shoulders.
What does the levator scapula muscle do?
The levator scapulae muscles are superficial extrinsic muscles of the back that primarily function to elevate the scapulae.
