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Back Trunk Muscles

Deep muscles of the back

TermDefinition
Erector Spinae (iliocostalis, longissimus, spinalis) Origin: vertebral column, ilium, ribs; Insertion: ribs, vertebral column, occipital and temporal bones; Action: extends and rotates vertebral column and head
Multifidus Origin: iliac crest, vertebral column; Insertion: vertebral column above origins; Action: extends and rotates vertebral column
Quadratus Lumborum Origin: posterior iliac crest; Insertion: T12 and L1-4, rib 12; Action: extends and abducts vertebral column
Rhomboid Major Origin: spines of T2-5; Insertion: lower one-third of vertebral border of scapula; Action: adducts scapula (draws scapulae together)
Rhomboid Minor Origin: ligamentum nuchae, spines C7-T1; Insertion: vertebral border of scapula at scapular spine; Action: adducts scapula (draws scapulae together)
Splenius Origin: ligamentum nuchae, C7-T6; Insertion: C2-4, occipital and temporal bone; Action: extends and rotates head
Semispinalis Origin: C7-T12; Insertion: occipital bone, T1-4; Action: extends head and vertebral column, rotates vertebral column
Created by: koalas2013
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