back muscles

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Author:
jtsterner
ID:
3172
Filename:
back muscles
Updated:
2009-12-15 18:29:44
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back muscles
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Description:
Origin, Insertion, Innervation & Function
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  1. Trapezius
    O - Superior nuchal line, external occipital protuberance, ligamentum nuchae, spinous processes of CVII to TXII

    I - Lateral one-third of clavicle, acromion, spine of scapula

    In - Motor-accessory nerve [XI]; proprioception-C3 and C4

    F - Assists in rotating the scapula during abduction of humerus above horizontal; upper fibers elevate, middle fibers adduct, and lower fibers depress scapula
  2. Levator Scapulae
    O - Transverse processes of CI to CIV

    I - Upper portion medial border of scapula

    In - C3 to C4 and dorsal scapular nerve (C4, C5)

    F - Elevates scapula
  3. Latissimus Dorsi
    O - Spinous processes of TVII to LV and sacrum, iliac crest, ribs X to XII

    I - Floor of intertubercular sulcus of humerus

    In - Thoracodorsal nerve (C6 to C8)

    F - Extends, adducts, and medially rotates humerus
  4. Rhomboid Major
    O - Spinous processes of TII to TV

    I - Medial border of scapula between spine and inferior angle

    In - Dorsal scapular nerve (C4, C5)

    F - Retracts (adducts) and elevates scapula
  5. Rhomnoid Minor
    O - Lower portion of ligamentum nuchae, spinous processes of CVII and TI

    I - Medial border of scapula at the spine of scapula

    In - Dorsal scapular nerve (C4, C5)

    F - Retracts (adducts) and elevates scapula
  6. Serratus Posterior Inferior
    O - Spinous processes of TXI to LIII and supraspinous ligaments

    I - Lower border of ribs IX to XII just lateral to their angles

    In - Anterior rami of lower thoracic nerves (T9 to T12)

    F - Depresses ribs IX to XII and may prevent lower ribs from being elevated when the diaphragm contracts
  7. Serratus Posterior Superior
    O - Lower portion of ligamentum nuchae, spinous processes of CVII to TIII and supraspinous ligaments

    I - Upper border of ribs II to V just lateral to their angles

    In - Anterior rami of upper thoracic nerves (T2 to T5)

    F - Elevates ribs II to V
  8. Transversospinal
    • Semispinalis - most superficial
    • Multifidus - best developed in thoracic region
    • Rotatores - deepest; best developed in thoracic region
    • -Rotatores brevis - cross one vertebra
    • -Rotatores longus - cross two vertebrae
  9. Erector Spinae
    • Iliocostalis - most lateral column
    • Longissimus - intermediate column
    • Spinalis - most medial column
  10. Spinotransversales
    • Splenius Capitis
    • O -Lower ligamentum nuchae & spinous processes of C7-T4
    • I -Occipital bone & mastoid process of temporal bone

    • Splenius Cervicis
    • O -Spinous processes of T3-T6
    • I -Transverse processes of upper cervical vertebrae
  11. Segmental
    • Levatores costarum - deep segmental muscle of back; attaches transverse processes of C7-T11 to ribs below & can elevate the ribs
    • Interspinalis - connect adjacent spinous processes
    • Intertransversarii - connect adjacent transverse processes

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