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Muscles of the trunk and back

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Muscle
Attachment 1 (origin)
Attachment 2 (insertion)
Action 1
Action 2
Other actions
Innervation
Rectus abdominis   Pubic spine   Xiphoid process and the cartilage of ribs 5-7   Flexion of the trunk   Posterior tilt of the pelvis   (blank)   Intercostal Nerves  
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External oblique (External abdominal oblique)   Anterior iliac crest, pubic bone, and the abdominal aponeurosis   Lower 8 ribs (5-12)   Flexion of the trunk   Lateral flexion of the trunk   Contralateral rotation of the trunk; Posterior tilt of the pelvis   Intercostal Nerves  
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Internal oblique (Internal abdominal oblique)   Inguinal ligament, Iliac crest, and the thoracolumbar fascia   Lower 3 ribs (10-12) and the abdominal aponeurosis   Flexion of the trunk   Lateral flexion of the trunk   Ipsilateral rotation of the trunk; Posterior tilt of the pelvis   Intercostal Nerves  
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Transverse abdominis   Inguinal ligament, iliac crest, thoracolumbar fascia, and the lower costal cartilages   Abdominal aponeurosis   Compression of the abdominal contents       Intercostal Nerves  
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Diaphragm   Internal surfaces of the ribcage, sternum and spine   Central tendon of the diaphragm   Increases the volume of the throacic cavity       Phrenic Nerve  
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Spinalis   Spinous processes of T11 -L2 and C7 and the entire Nuchal ligament   Spinous processes of T5-12 and C2   Extension of the trunk, neck and head   Lateral flexion of the trunk, neck and head   Ipsilateral rotation of the trunk, neck and head   Spinal Nerves  
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Quadratus lumborum   12th rib and spinous processes of L1-4   Posterior iliac crest   Elevation of the pelvis   Anterior tilt of the pelvis   Lateral flexion of the trunk; Extension of the trunk   Lumbar Plexus  
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Longissimus   Sacrum, Iliac crest and transverse processes of L1-5 and T1-5 and the articular processes of C5-7   Ribs 4-12, transverse processes of T1-12 and C2-6 and the mastoid process of the temporal bone   Extension of the trunk, neck and head   Lateral flexion of the trunk, neck and head   Ipsilateral rotation of the trunk, neck and head; Anterior tilt of the pelvis   Spinal Nerves  
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Iliocostalis   Thoracolumbar aponeurosis   Ribs 1-12 and transverse processes of C4-7   Extension of the trunk and neck   Lateral flexion of the trunk and neck   Ipsilateral rotation of the trunk and neck; Anterior tilt of the pelvis   Spinal Nerves  
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Created by: skpoem
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