Term
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Definition
Origin: External occipital protuberance, superior nuchal lines, nuchal ligament, spinous processes of C7-T12
Insertion: one third of clavicle, acromion process, scapular spine
Action: Upper fibers: extends the neck and head, elevates scapula, and upwardly rotates the scapula. Bilaterally: extends the head and neck. Middle fibers: retracts the scapula. Lower fibers: depresses the scapula |
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Term
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Definition
Origin: Spinous processes of T2-T5
Insertion: Vertebral border of scapula
Action: Retracts the scapula and downwardly rotates the scapula |
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Term
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Definition
Origin: spinous processes of C7-T1
Insertion: Vertebral border of scapula
Action: Retracts the scapula and downwardly rotates the scapula |
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Term
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Definition
Origin: Transverse processes of C1-C4
Insertion: Superior angle of the spine scapula at the root
Action: Unilaterally: elevates the scapula, downwardly rotates the scapula, laterally flexes the neck. Bilaterally: extends head and neck |
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Term
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Definition
Origin: Ribs 1-8
Insertion: Anterior medial border of the scapula
Action: Protracts the scapula and upwardly rotates the scapula |
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Term
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Definition
Origin: Ribs 3-5
Insertion: Coracoid process of scapula
Action: Depresses the scapula, protracts the scapula, downwardly rotates the scapula, and assists in forced inspiration |
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Term
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Definition
Origin: Coracoid process of the scapula
Insertion: Medial humeral shaft
Action: Flexes and adducts the shoulder |
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Term
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Definition
Origin: Medial half of clavicle edge of sternal body, ribs 1-8
Insertion: Intertubercular groove of the humerus
Action: Adducts the shoulder, medially rotates the shoulder, flexes the shoulder (clavicular fibers only), and extends the shoulder (sternal and costal fibers |
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Term
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Definition
Origin: Inferior half of the lateral border of the scapula
Insertion: Intertubercular groove of the humerus
Action: Teres major extends the shoulder, medially rotates the shoulder, adducts the shoulder |
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Term
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Definition
Origin: Spinous process of T6-L5, ribs 9-12, posterior iliac crest, and posterior sacrum
Insertion: Intertubercular groove of the humerus
Action: Extends the shoulder, medially rotates the shoulder, adducts the shoulder |
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Term
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Definition
Origin: Lateral third of clavicle, acromion process, scapular spine
Insertion: Deltoid tuberosity of humerus
Action: Anterior fibers: flex and medially rotate the shoulder. Medial fibers: abducts the shoulder, Posterior fibers: extend and laterally rotate the shoulder |
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Term
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Definition
Origin: Supraspinous fossa of the scapula
Insertion: Greater tubercle of the humerus
Action: Abducts the shoulder, stabilizes head of humerus in glenoid cavity |
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Term
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Definition
Origin: Infraspinous fossa of the scapula
Insertion: Greater tubercle of the humerus
Action: Laterally rotates the shoulder, adducts the shoulder, extends the shoulder, horizontally abducts the shoulder |
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Term
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Definition
Origin: Superior half of the lateral border of the scapula
Insertion: Greater tubercle of the humerus
Action: Adducts the shoulder and laterally rotates the shoulder, Extends the shoulder; horizontally abducts the shoulders; stabilizes head of humerus in glenoid cavity |
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Term
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Definition
Origin: Subscaular fossa of the scapula
Insertion:Lesser tubercle of the humerus
Action: Medially rotates the shoulder, stabilizes head of humerus in glenoid cavity |
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Term
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Definition
Origin: Long head: supraglenoid tubercle of scapula. Short head: Coracoid process of scapula
Insertion: Radial tuberosity
Action: Flexes the elbow, supinates the forearm, and flexes the shoulder |
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Term
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Definition
Origin: Long head: Infraglenoid tubercle of the scapula. Lateral head: posterior proximal humeral shaft. Medial head: posterior distal humeral shaft
Insertion: Olecranon process
Action: Extends the elbow and extends the shoulder |
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