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14 Cards in this Set
- Front
- Back
Latissimus Dorsi
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Broad, flat, triangular muscle of the lower back
O: indirect attachment via lumbodorsal fascia into spines of lower six thoracic vertebrae, lumbar vertebrae, lower 3-4 ribs, and iliac crest I: spirals around teres major to insert in floor of intertubercular groove of humerus A: prime mover in arm (upper arm) extension |
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Trapezius
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Most superficial muscle of posterior thorax, flat and triangular in shape
O: occipital bone, ligamentum nuchae, and spines of C7/all thoracic vertebrae I: a continuous insertion along acromion and spine of scapula and lateral third of clavicle A: Stabilizes, raises, retracts, and rotates scapula |
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Rhomboids
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Two rectangular muscles lying deep to trapezius and inferior to levator scapulae.
O: spinous processes of C7 and T1 and spinous processes of T2-T5 I: medial border of scapula A; retract scapula, squaring shoulders |
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Levator Scapulae
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Located at back and side of neck, deep to trapezius.
O: transverse processes of C1-C4 I: medial border of the scapula, superior to the spine A: elevates/adducts scapula in concert with superior fibres of trapezius |
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Subscapularis
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Forms part of posterior wall of axilla. A rotator cuff muscle.
O: subscapular fossa of scapula I: lesser tubercle of humerus A: chief medial rotator of humerus (pec major synergist) |
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Supraspinatus
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Located on posterior aspect of scapula, deep to trapezius. Rotator cuff muscle.
O: supraspinous fossa of scapula I: superior part of greater tubercle of humerus A: stabilizes shoulder joint (preventing downward dislocation) |
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Infraspinatus
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Scapular muscle partially covered by deltoid and trapezius. Rotator cuff muscle.
O: supraspinous fossa of scapula I: greater tubercle of humerus posterior to insertion of supraspinatus A: Helps to hold head of humerus in glenoid cavity. |
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Teres Major
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Thick, rounded muscle located inferior to teres minor.
O: posterior surface of scapula at inferior angle. I: intertubercular groove of the humerus A: posteromedially extends, medially rotates, and adducts humerus (synergist of latissimus dorsi) |
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Teres Minor
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Small, elongated muscle inferior to infraspinatus. Rotator cuff muscle.
O: Lateral border of dorsal scapular surface I: greater tubercle of humerus inferior to infraspinatus insertion A: helps to hold head of humerus in glenoid cavity (infraspinatus synergist) |
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Coracobrachialis
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Small, cylindrical muscle.
O: coracoid process of scapula I: medial surface of humerus shaft A: Flexion and adduction of humerus. (Synergist of pec major) |
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Erector Spinae
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Intermediate layer of intrinsic back muscles
O: ribs, transverse processes/spines of vertebrae I: ribs, transverse processes/spines of vertebrae A: Prime mover of back extension, lateral bending of back, maintaining posture |
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Quadratus Lumbornum
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Fleshy muscle forming part of posterior abdominal wall.
O: iliac crest and lumbar fascia I: transverse processes of upper lumbar vertebrae and lower margin of rib 12 A: flexes vertebral column laterally |
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Semispinalis
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Composite muscle forming part of deep layer of intrinsic back muscles.
O: transverse processes of C7-T12 I: occipital bone and spinous processes of cervical vertebrae/T1-T4. A: Extends vertebral column and head and rotates them to opposite sides. (Sternocleidomastoid synergist) |
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Rotator Cuff
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Supraspinatus, infraspinatus, subscapularis, teres minor
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