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Musculoskeletal Anat
Pectoral Girdle and Arm @ Shoulder muscle names, origin, insertion, and action
Muscle | Origin | Insertion | Action |
---|---|---|---|
Levator scapulae | Upper cervical vertebrae (transverse processes) | Superior angle of scapula Medial border of scapula | Scapula elevation |
Serratus anterior | Ribs 1-8 | Inferior angle of scapula Medial border of scapula | Scapula protraction Upward rotation of glenoid cavity |
Deltoid | Clavicle Acromion process Spine of scapula | Deltoid tuberosity on shaft of humerus | Arm abduction @ shoulder Arm flexion and extension Medial and Lateral rotation @ shoulder |
Pectoralis major | Clavicle Sternum Ribs 1-6 | Intertubercular groove of humerus | Arm adduction Arm flexion @ shoulder Medial rotation @ shoulder |
Latissimus dorsi | Lower vertebrae (spinous processes) Sacrum Iliac crest | Intertubercular groove of humerus | Arm extension Adduction Medial rotation @ shoulder |
Coracobrachialis | Coracoid process of scapula | Humerus | Arm flexion Arm adduction @ shoulder |
Teres major | Inferior angle of scapula | Intertubercular groove of humerus | Arm adduction, Medial rotation, Extension @ shoulder |
Supraspinatus (part of rotator cuff) | Supraspinous fossa of scapula | Greater tubercle of humerus | Arm abduction @ shoulder |
Infraspinatus (part of rotator cuff) | Infraspinous fossa of scapula | Greater tubercle of humerus | Arm lateral rotation @ shoulder |
Teres minor (part of rotator cuff) | Posterior (dorsal) lateral scapula | Greater tubercle of humerus | Arm lateral rotation @ shoulder |
Subscapularis (part of rotator cuff) | Subscapular fossa of scapula | Lesser tubercle of humerus | Arm medial rotation @ shoulder |
Trapezius | Occipital bone Thoracic vertebrae (spinous processes) | Spine Acromion of scapula Clavicle | Scapula elevation, retraction, and depression |
Rhomboids | Upper thoracic vertebrae (spinous processes) | Medial border of scapula | Scapula adduction and retraction Downward rotation of glenoid cavity |