Superficial back muscles- origin, insertion, action, innervation
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| Origin of upper trapezius m | external occipital protuberance
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| Insertion of upper trapezius m | lateral clavicle, acromion process
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| Action of upper trapezius m | elevation, upward rotation of scapula
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| Innervation of upper trapezius m | spinal accessory n (motor), C3-C4 (sensory)
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| Origin of middle trapezius m | T1-5
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| Insertion of middle trapezius m | spine of scapula
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| Action of middle trapezius m | retraction of scapula
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| Innervation of middle trapezius m | spinal accessory n (motor), C3-C4 (sensory)
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| Origin of lower trapezius m | T6-12
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| Insertion of lower trapezius m | root of spine of scapula
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| Action of lower trapezius m | depression of scapula
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| Innervation of lower trapezius m | spinal accessory n (motor), C3-C4 (sensory)
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| Origin of latissimus dorsi m | vertebrae, ilium, lumbodorsal fascia
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| Insertion of latissimus dorsi m | intertubercular groove of humerus
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| Action of latissimus dorsi m | extends, adducts upper arm
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| Innervation of latissimus dorsi m | thoracodorsal n
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| Origin of rhomboid major m | T1- T4
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| Insertion of rhomboid major m | medial border of scapula
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| Action of rhomboid major m | retracts, rotates, fixes scapula
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| Innervation of rhomboid major m | dorsal scapular n
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| Origin of rhomboid minor m | C6-C7
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| Insertion of rhomboid minor m | medial border of scapula
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| Action of rhomboid minor m | retracts, rotates, fixes scapula
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| Innervation of rhomboid minor m | dorsal scapular n
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| Origin of Teres major | lower, axillary border of scapula
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| Insertion of teres major m | upper, anterior surface of humerus
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| Action of teres major m | assists in extension, adduction, medial rotation of arm
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| Innervation of teres major m | lower subscapular n
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| Name the rotator cuff muscles | SITS: supraspinatus m, infraspinatus m, teres minor m, subscapularis m
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| Origin of supraspinatus m | supraspinous fossa of scapula
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| Insertion of supraspinatus m | greater tubercle of humerus
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| Action of supraspinatus m | assists in abducting arm
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| Insertion of supraspinatus m | suprascapular n
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| Origin of infraspinatus m | infraspinatus border of scapula
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| Insertion of infraspinatus m | greater tubercle of humerus
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| Action of infraspinatus m | lateral rotation of arm
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| Innervation of infraspinatus m | suprascapular n
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| Origin of teres minor m | axillary border of scapula
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| Insertion of teres minor m | greater tubercle of humerus
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| Action of teres minor m | laterally rotate arm
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| Innervation of teres minor m | axillary n
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| Origin of subscapularis m | subscapular fossa on scapula
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| Insertion of subscapularis m | lesser tubercle of humerus
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| Action of subscapularis m | medial rotation
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| Innervation of subscapularis m | suprascapular n
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chiro0912
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