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Shoulder Muscles
Shoulder muscles, action, origin, insertion, and innervation for ID 356
| Question | Answer |
|---|---|
| What are the rotator cuff muscles? | Supraspinatus, infraspinatus, Teres minor, subscapularis |
| Supraspinatus - origin | supraspinous fossa |
| supraspinatus - action | abduction, some lateral rotation, stabilization |
| supraspinatus - innervation | suprascapular |
| supraspinatus - insertion | greater tubercule of the humerus |
| infraspinatus - origin | infrapsinous fossa |
| infraspinatus - insertion | greater tubercle of humerus |
| infraspinatus - action | lateral rotation, extension of humerus |
| infraspinatus - innervation | suprascapular |
| teres minor - origin | upper 2/3 border of scapula |
| teres minor - insertion | greater tubercle |
| teres minor - action | lateral rotation, horizontal abduction, extension of the humerus |
| teres minor - innervation | axillary |
| subscapularis - origin | subscapular fossa |
| subscapularis - insertion | lesser tubercle of humerus |
| subscapularis - action | medial rotation, adduction of humerus |
| subscapularis - innervation | upper and lower supscapular |
| levator scapula - origin | transverse process of C1 - C4 |
| Levator scapula - insertion | vertebral border of scapula - superior angle |
| levator scapula - action | elevates scapula, downward rotation |
| levator scappula - innervation | dorsal scapular nerve and brances of C3-C4 |
| Serratus anterior - origin | ribs 1-8 or 9 |
| serratus anterior - insertion | medial border of the scapula |
| serratus anterior - action | abduction, protraction, stabilizes |
| serratus anterior - innervation | long thoracic |
| pectoralis minor - origin | ribs 3-5 near costal cartilage |
| pectoralis minor - insertion | coracoid process of scapula |
| pectoralis minor - action | stabilizes scapula and downward rotation, depression, proctraction |
| pectoralis minor - innervation | medial pectoral nerve |
| rhomboid major - origin | T2-T5 |
| rhomboid minor - origin | C7-T1 |
| rhomboid major and minor - insertion | vertebral border of scapula |
| rhomboid major - action | retraction, rotation, fixes scapula to thoracic wall |
| rhomboid minor - action | elevation |
| rhomboid major and minor - innervation | doral scapular nerve |
| upper, middle and lower trap | external occipital protuberance - C7-T12 |
| upper trap - insertion | lateral 3rd of acromion process |
| middle trap - insertion | spine of scapula |
| lower trap - insertion | root of spine of scapula |
| upper trap - action | elevation, upward rotation |
| middle trap - action | retraction |
| lower trap - action | depression, retraction |
| upper, middle, and lower trap - innervation | accessory nerve and branches C3, C4 |