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Muscles - Origins and Insertions 2

1. Origin: Occipital bone and spinous processes of thoracic vertebrae
Insertion: Scapula and clavicle
Action: Elevation, superior rotation, inferior rotation, and depression of scapula
2. Origin: Spinous processes of lower thoracic vertebrae, iliac crest, lower ribs
Insertion: Intertubercular groove and lesser tubercle of humerus
Action: Adduction and extension of the arm at the shoulder
3. Origin: Subscapular fossa
Insertion: Lesser tubercle of humerus
Action: Medial rotation of the arm at the shoulder
4. Origin: Supraspinous fossa
Insertion: Greater tubercle of humerus
Action: Abduction of the arm at the shoulder
5. Origin: Infraspinous fossa
Insertion: Greater tubercle of humerus
Action: Lateral rotation of the arm at the shoulder
6. Origin: Lateral border of scapula
Insertion: Greater tubercle of humerus
Action: Lateral rotation of the arm at the shoulder
7. Origin: Scapula and clavicle
Insertion: Deltoid tuberosity of humerus
Action: Abduction, flexion, and extension of the arm at the shoulder
8. Origin: Clavicle, first six costal cartilages, and sternum
Insertion: Greater tubercle of humerus
Action: Flexion, adduction, and medial rotation of the arm at the shoulder
9. Origin: Long head - Supraglenoid tubercle (scapula); Short head - Coracoid process (scapula)
Insertion: Radial tuberosity
Action: Flexes forearm at the elbow; supinates forearm
10. Origin: Long head - Infraglenoid tubercle (scapula), Lateral head - Posterolateral humerus; Medial head - Posteromedial humerus
Insertion: Olecranon (ulna)
Action: Extends forearm at the elbow

 

 
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