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muscles of thorax


muscles origininsertionfunction
Intercostal (internal) superior margin of each rib inferior border of next rib above expiration; depresses ribs (25% of breathing)
Rectus Abdominus pubic crest and symphysis xiphoid process and inferior ribs flexes vertebral column; depresses thorax; compresses abdomen (sit ups / crunches)
External Abdominal Oblique fifth to twelfth ribs Illiac crest, inguinal ligament, and rectus sheath flexes and rotates vertebral column; compresses abdomen, depresses thorax (twisting flexion)
Internal Abdominal Oblique Illiac crest, inguinal ligament and lumbar fascia tenth to twelfth ribs and rectus sheath flexes and rotates vertebral column; compresses abdomen, depresses thorax (twisting flexion)
Transversus Abdominus seventh to twelfth costal cartilages ,lumbar fascia, Illiac crest, and inguinal ligament Xiphoid process, linea alba, and pubic tubercle compresses abdomen ( use this when you go #2)
Quadratus Lumborum Illiac crest and lower lumbar vertebrae twelfth rib and upper lumbar vertebrae rotates vertebral column and depresses 12th rib (twisting flexion)
passive * diaphragm * intercostals ------------------------------------------------------------------------------- -------------------------------------------------------------------------------
active *diaphragm *intercostals *QL(ex breathing out) *scalenes (pulling up inhale) *sternocleidomastoid(inhale) *abs (exhale) -------------------------------------------------------------------------------- -------------------------------------------------------------------------------
Diaphragm Interior of the ribs, sternum, and lumbar vertebrae central tendon of the diaphragm inspiration, depress floor of the thorax (75% of breathing)
Intercostal (external) inferior margin of each rib superior border of next rib below Inspiration; elevates ribs (25% of breathing)
Created by: Sierra987