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bccota 25 ch 7/8
BCC OTA 25 Muscles of the shoulder/sh.girdle
| Question | origin | insertion | action |
|---|---|---|---|
| Subscapularis | Subscapular fossa of the scapula | Lesser tubercle of humerus | Shoulder medial rotation |
| Coracobrachialis | Coracoid process of the scapula | medial surface of the humerus near the midpoint | Stabilizes the shoulder joint |
| Anterior Deltoid | Lateral 3rd of the clavicle | Deltoid tuberosity of the humerus | Shoulder abduction, flexion, medial rotation, horizontal abduction |
| Middle Deltoid | Acromium process | Deltoid tuberoisity of the humerus | Shoulder abduction |
| Posterior Deltoid | Spine of scapula | Deltoid tuberoisity of humerous | Shoulder abduction, extension, lateral rotation, horizontal abduction |
| Supraspinatus | Supraspinous fossa of the scapula | Greater tubercle of the humerus | Shoulder abduction |
| Pecoralis Major | Medial 3rd of clavicle and sternum at costal cartilage of the first 6 ribs | Lateral lip of bicipital groove of humerus | Shoulder adduction, medial rotation, horizontal addution |
| Latissimus Dorsi | Spinous processes of T-7-L5, posterior sacral surface, iliac crest, & lower 3 ribs | Medial lip of bicipital groove of humerus | Shoulder extension adduction, medial rotation |
| Teres Major | Auxilary border of scapula near inferior angle | Crest below lesser tubercle (next to latissimus dorsi muscle attachment) | Shoulder extensiion abduction and medial rotation |
| Upper Trapezius | Occipital Protuberance & Spinous Processes of upper cervical vertebrae | Lateral end of clavicle and the acromion process | scapular elevation and upward rotation |
| Middle Trapezius | Spinous processes of C 7-T3 | Scapular spine | Scapular retraction |
| Lower Trapezius | Spinous processes of mid/lower thoracic vertebrae | Base of the scapular spine | Scapular depression and upward rotation |
| Levator Scapula | Transverse processes of C1-C4 | Vertebral border of scapula btn superior angle and spine | Scapular elevation and downward rotation |
| Rhomboid Muscles | Spinous processes of C7-T5 | Vertebral border of scapula btn spine and inferior angle | Scapular retraction, elevation and downward rotation |
| Serratus anterior | Lateral surface of upper 8 ribs | Vetebra border of scapula, anterior surface | Scapular protraction and upward rotation, "prevents winging" |
| Pectoralis Minor | Anterior surface, 3rd-5th ribs | Coracoid process of scapula | Scapular depression, protraction, downward rotation and tilt |
| Infraspinatus | Infraspinous fossa of scapula | greater tubercle of humerous | shoulder lateral rotation, horizontal abduction |
| Teres Minor | Auxilary border of scapula | Greater tubercle of humerus | Shoulder lateral rotation, horizontal abduction |