What are the three muscles that act on the shoulder girdle?
It is musculotendinous in nature, formed mainly by the trapezius, rhomboids and serratus anterior muscles, while the pectoralis minor muscle also plays a role in its movements. The scapulothoracic joint permits gliding movements of the scapula around the fulcrum of the acromioclavicular joint.
What muscles are involved in shoulder girdle adduction?
Retraction or adduction of the scapula is caused by the trapezius and rhomboid muscles.
What muscle rotates the shoulder anteriorly?
Figure 7.28. The deltoid, the thick muscle that creates the rounded lines of the shoulder is the major abductor of the arm, but it also facilitates flexing and medial rotation, as well as extension and lateral rotation. The subscapularis originates on the anterior scapula and medially rotates the arm.
What are the major muscles of the shoulder girdle and the arm?
Muscles that move the shoulder and arm include the trapezius and serratus anterior. The pectoralis major, latissimus dorsi, deltoid, and rotator cuff muscles connect to the humerus and move the arm.
Which muscles move and stabilize the shoulder girdle on the anterior side of the body?
Muscles of the Pectoral Girdle
| Muscle Name | Function/Movement |
|---|---|
| Pectoralis Major | Prime mover in arm flexion, adducts & medially rotates arm |
| Pectoralis Minor | Protract and depress the scapula |
| Subclavius | Stabilize and depress clavicle |
| Serratus Anterior | The prime mover in scapular protraction, stabilize the scapula |
Which are the 4 main muscles affecting movement of the shoulder girdle?
The four rotator cuff muscles include the supraspinatus, infraspinatus, teres minor, and subscapularis. [2][1] Other muscles that form the shoulder girdle include the pectoralis major, pectoralis minor, the deltoids, trapezius, and the serratus anterior.
What is the boxer muscle?
The serratus anterior, also known as the “boxer’s muscle,” is largely responsible for the protraction of the scapula, a movement that occurs when throwing a punch.
What action does the infraspinatus do?
The infraspinatus muscle’s action on the shoulder is primarily through its function as a rotator cuff muscle providing glenohumeral stability. The rotator cuff applies compression upon the head of the humerus that allows for the stabilization of the humeral head during shoulder abduction.
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.
Which is honeymoon muscle?
Sartorius, the Honeymoon Muscle: It is called so because it causes abduction and lateral rotation at hip joint which would be a critical action for all the action that is required during the Honeymoon.