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Nat. Review chpt. 7d

Muscles of the trunk and back

MuscleAttachment 1 (origin)Attachment 2 (insertion)Action 1Action 2Other actionsInnervation
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
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
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
Transverse abdominis Inguinal ligament, iliac crest, thoracolumbar fascia, and the lower costal cartilages Abdominal aponeurosis Compression of the abdominal contents Intercostal Nerves
Diaphragm Internal surfaces of the ribcage, sternum and spine Central tendon of the diaphragm Increases the volume of the throacic cavity Phrenic Nerve
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
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
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
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
Created by: skpoem
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