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Skip to: Top | Bones and Bony Landmarks | Muscles
| Origin | Short Head: Coracoid Process Of Scapula Long Head: Supraglenoid Tubercle Of Scapula |
| Insertion | Tuberosity Of The Radius And Aponeurosis Of The Biceps Brachii |
| Actions | Flex The Elbow, Supinate The Forearm, Flex The Shoulder Joint |
| Origin | Coracoid Process Of Scapula |
| Insertion | Medial Surface Of Middle Shaft Of Humerus |
| Actions | Flex, Adduct The Should Joint |
| Origin | Lateral One Third Of Clavicle, Acromion And Spine Of Scapula |
| Insertion | Deltoid Tuberosity |
| Actions | All Fibers: Abduct The Shoulder Joint
Posterior: Extend And Laterally Rotate The Shoulder Joint Anterior: Flex And Medially Rotate The Shoulder Joint |
| Origin | Spinous Processes Of Last Six Thoracic Vertebrae, Last three or four ribs, Thoracolumbar Aponeurosis, and Posterior Iliac Crest |
| Insertion | Crest Of The Lesser Tubercle Of The Humerus |
| Actions | Extend, Adduct, Medially Rotate The Shoulder Joint |
| Origin | Transverse Processes Of 1st Thru 4th Cervical Vertebrae |
| Insertion | Medial Border And Superior Angle Of Scapula |
| Actions | Unilateral: Elevate, Downwardly Rotate The
Scapula, Laterally Flex Head And Neck Bilateral: Extend Head And Neck |
| Origin | Medial Half Of Clavicle, Sternum, Cartilage Of Ribs One Thru Six |
| Insertion | Crest Of Greater Tubercle Of Humerus |
| Actions | As A Whole: Adduct, Medially Rotate The
Shoulder Joint, May Assist In Elevating The thorax in forced
inspiration Upper Fibers: Flex, Medially Rotate, Horizontally Adduct The Shoulder Joint Lower Fibers: Extend, Adduct The Shoulder Joint |
| Origin | Third, Fourth And Fifth Ribs |
| Insertion | Coracoid Process Of Scapula |
| Actions | Depress, Abduct, Tilt The Scapula Anteriorly, Assist In Forced Inspiration |
| Origin | Spinous Processes Of T-2 To T-5 |
| Insertion | Medial Border Of The Scapula Between Spine And Inferior Angle |
| Actions | Adduct, Elevate, Downwardly Rotate The Scapula |
| Origin | Spinous Processes Of C-7 And T-1 |
| Insertion | Medial Border Of The Scapula Between Spine And Inferior Angle |
| Actions | Adduct, Elevate, Downwardly Rotate The Scapula |
| Origin | Supraspinous Fossa Of Scapula |
| Insertion | Greater Tubercle Of Humerus |
| Actions | Adduct Humerus, Stabilize Head Of Humerus In Glenoid Cavity |
| Origin | Infraspinous Fossa Of Scapula |
| Insertion | Greater Tubercle Of Humerus |
| Actions | Laterally Rotate, Adduct, Extend The Shoulder Joint, Stabilize Head of Humerus in Glenoid Cavity |
| Origin | Subscapular Fossa Of The Scapula |
| Insertion | Lesser Tubercle Of The Humerus |
| Actions | Medially Rotate The Shoulder Joint, Stabilize Head of Humerus in Glenoid Cavity |
| Origin | Superior Half Of Lateral Border Of Scapula |
| Insertion | Greater Tubercle Of Humerus |
| Actions | Laterally Rotate, Adduct, Extend Shoulder Joint, Stabilize Head of Humerus in Glenoid Cavity |
| Origin | Surfaces Of Upper 8 Or 9 Ribs |
| Insertion | Anterior Surface Of Medial Border Of Scapula |
| Actions | With Origin Fixed: Abduct The Scapula, Hold
Medial Border Of Scapula Against Rib Cage Scapula Stabilized: May Act In Forced Inspiration |
| Origin | First Rib And Cartilage |
| Insertion | Inferior, Lateral Aspect Of The Clavicle |
| Actions | Draws Clavicle Down And Forward, Elevates 1st Rib, Stabilizes The Sternoclavicular Joint |
| Origin | Dorsal Surfaces Of Inferior Angle And Lower Half Of Lateral Border of Scapula |
| Insertion | Crest Of The Lesser Tubercle Of The Humerus |
| Actions | Extend, Adduct, Medially Rotate The Humerus |
| Origin | External Occipital Protuberance, Medial Portion Of Superior Nuchal Line of Occiput, Ligamentum Nuchae and Spinous Processes of C-7 Through T-12 |
| Insertion | Lateral Portion Of Clavicle, Acromion And Spine Of Scapula |
| Actions | Upper:
Middle: Adduct, Stabilize The Scapula Lower: Depress, Upwardly Rotate The Scapula |
| Origin | Long Head: Infraglenoid Tubercle Of Scapula Lateral Head: Posterior Surface Of Proximal Half Of Humerus Medial Head: Posterior Surface Of Distal Half Of Humerus |
| Insertion | Olecranon Process Of Ulna |
| Actions | All Heads: Extend The Elbow
Long Head: Extend, Adduct The Shoulder Joint |