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Flexion of the Trunk

 

Muscles involved in Trunk Flexion

  • Rectus Abdominus

  • External Obliques

  • Internal Obliques

  • Psoas Major

  • Iliacus

 

 

 

 

                                             (Biel, 2010)

Extension of the Trunk

 

Muscles involved in Trunk Extension

  • Longissimus

  • Iliocostalis

  • Multifidi

  • Rotatores

  • Semispinalis capitis

  • Spinalis

  • Quadratus lumborum

  • Interspinalis

  • Intertransversarii

  • Latissimus dorsi              (Biel, 2010)

Lateral Flexion of the Trunk

 

Muscles involved in Trunk Lateral Flexion

  • Iliocostalis

  • External oblique

  • Internal oblique

  • Longissimus

  • Quadratus lumborum

  • Psoas major

  • Intertransversarii

  • Spinalis

  • Latissimus dorsi

                                                         (Biel, 2010)

Elevation/Expansion of Thorax (Inhalation)

 

Muscles involved in Thorax Elevation

  • Anterior Scalene

  • Middle Scalene

  • Posterior Scalene

  • Sternocleidomastoid

  • External Intercostals

  • Serratus Posterior Superior

  • Pectoralis Major (with fixed arm)

  • Pectoralis Minor (with fixed scapula)

  • Serratus anterior (with fixed scapula)

  • Subclavius (elevates first rib)    (Biel, 2010)

Depression/Collapse of Thorax (Exhalation)

 

Muscles involved in Thorax Depression

  • Internal Intercostals

  • Serratus posterior Inferior

 

 

 

 

 

 

 

                                                        (Biel, 2010)

Rotation of the Trunk

 

Muscles involved in Trunk Rotation

  • External Oblique (to opposite side)

  • Internal Oblique (to same side)

  • Multifidi (to opposite side

  • Rotatores (to opposite side)

 

 

 

 

 

 

                                                 (Biel, 2010)

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