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Shoulder and Arm MM
Trail Guide to the Body by Andrew Biel
| Question | Answer |
|---|---|
| Origin of Deltoid | lateral one third of clavicle acromion spine of scapula |
| Insertion of Deltoid | deltoid tuberosity |
| Action of All Fibers of Deltoid | abduct the shoulder |
| Action of Anterior Fiber of Deltoid | flex the shoulder, medially rotate the shoulder, horizontally adduct the shoulder |
| Action of Posteror Fibers of Deltoid | extend the shoulder, laterally rotate the shoulder, horizontally abduct the shoulder |
| Origin of Trapezius | external occipital protuberance, medial portion of superior nuchal line of the occiput, ligamentum nuchae, spinous processes of C-7 through T-12 |
| Insertion of Trapezius | Lateral one third of clavicle, acrominon, spine of the scapula |
| Action of bilateral upper fibers of Trapezius | extend the head and neck |
| Action of unilateral upper fibers of Trapezius | laterally flex the head and neck to the same side, rotate the head and neck to the opposite side, elevate the scapula, upwardly rotate the scapula |
| Action of middle fibers of Trapezius | adduct the scapula, stabilize the scapula |
| Action of lower fibers of Trapezius | depress the scapula, upwardly rotate the scapula |