Muscles Connecting The Upper Limb To The Vertebral Column Assignment Help
| MUSCLE | ORIGIN | INSEDTION | NERVE SUPPLY | NERVE ROOTS | ACTION |
|---|---|---|---|---|---|
| Trapezius | Occipital bone, ligamentum nuchae, C7 spine and all thoracic vertebra | Upper fibres into lateral third of clavicle, middle & lower into acromion and spine of scapula | Spinal part of accessory nerve | XI cranial nerve | Upper fibers elevates scapula;middle fibers pulls scapula medially;lower fibers pull medial border of scapula down |
| Latissimus dorsi | Iliac crest, lumber facia,spine of lower six thoracic vertebra | Floor of bicipital groove of humerus | Thocacodorsal nerve | C6,7,8 | Extends, adducts, and medially rotates the arm |
| Levator scapulae | Transverse process of first four cervical vertebrae | Medial border of scapula | C3 & 4 and dorsal scapular nerve | C3,4,5 | Raise medial border of scapula |
| Rhomboid minor | Ligamentum nuchae & spines of 7th Cervicle & 1st thoracic | Medial border of scapula | Dorsal scapular nerve | C4,5 | Raise medial border of scapula upward and medially |
| Rhomboid major | 2nd to 5th thoracic spines | Medial border of scapula | Dorsal scapular nerve | C4,5 | Rais emedial border of scapula upward and medially |
| Deltoid | Lateral third of clavicle, acromion,spine of scapula | Middle of lateral surface of shaft of humerus | Axillary nerve | C5,6 | Abducts arm; flex and medially rotates arm; extends & laterally rotates arm |
| Supraspinatus | Supraspinus fossa of scapula | Greater tuberocity of humerus | Suprascapular nerve | C4,5,6 | Abducts arm and stabilizes shoulder joint |
| Infraspinatus | Infraspinus fossa of scapula | Greater tuberosity of humerus | Suprascapular nerve | C4,5,6 | Laterally rotes arm and stabilizes shoulder joint |
| Teres major | Lower third of lateral border of scapula | Medial lip of bicipital groove of humerus | Lower subscapular nerve | C6,7 | Medially rotates and adducts arm |
| Teres major | Upper two thirds of lateral border of scapula | Greater tuberosity of humerus | Axillary nerve | C4,5,6 | Laterally rotates arm & stabilizes shoulder |
| Subscapularis | Subscapular fossa | Lesser tuberosity of humerus | Upper & lower subscapular nerves | C5,6,7 | Medially rotates arm & stabilizes shoulder joints |
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