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Muscle Practial II
Origin, Insertion, and Action of Back Muscles
| Term | Definition |
|---|---|
| Origin of Trapezius | occipital bone, ligamentum nuchae and spinous process of C7 and all T |
| Insertino of Trapezius | acromion, spine of scapula, and clavicle |
| Action of Trapezius | allows movement of scapula and stabalizes it |
| Origin of Latissimus Dorsi | lumbodorsal fascia, T vertebrae, L vertebrae, lower 3 ribs and iliac crest |
| Insertion of Latissimus Dorsi | intertubercular sulcus of humerus |
| Action of Latissimus Dorsi | prime mover of arm extension; arm abductor |
| Origin of Rhomboids Major | spinous process of T2-T5 |
| Insertion of Rhomboids Major | medial border of scapula |
| Action of Rhomboids Major | stabilize scapula |
| Origin of Supra and Infraspinatus | scapula |
| Insertion of Supra and Infraspinatus | greater tubercle of humerus |
| Action of Supraspinatus | abduction |
| Action of Infraspinatus | rotates humerus laterally |
| Origin of Levator Scapulae | transverse process of C1-C4 |
| Insertion of Levator Scapulae | scapula |
| Action of Levator Scapulae | elevate and adduct the scapula |