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Rectus Abdominis Origin:
Pubic symphysis and pubic crest
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Rectus Abdominis Insertion:
Xiphoid process; 5th - 7th costal cartilages
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Rectus Abdominis Innervation:
Thoracoabdominal nerves and anterior rami of inferior thoracic nerves
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Rectus Abdominis Action:
flexes trunk and compresses abdominal viscera, stabilizes and controls tilt of pelvis
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Rectus Abdominis Blood Supply
superficial and deep epigastric artery and vein
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External Oblique Muscle Origin:
External surfaces of 5th - 12th ribs
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External Oblique Muscle Insertion:
linea alba, pubic tubercle, and anterior half of iliac crest
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External Oblique Muscle Innervation:
Thoracoabdominal nerves and subcostal nerves
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External Oblique Muscle Action:
compress and support abdominal viscera, flex and rotate the trunk
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External Oblique Muscle Blood Supply
superior and inferior epigastric artery and veins
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Internal oblique muscle Origin:
thoracolumbar fascia, anterior 2/3 of iliac crest, lateral half of inguinal canal
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Internal oblique muscle insertion:
inferior border of 10th-12th ribs, linea alba, and pubis via conjoint tendon
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Internal Oblique Muscle Innervation:
thoracoabdominal anterior rami of inferior six thoracic nerves; first lumbar nerve
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Internal oblique muscle action:
compress and support abdominal viscera, flex and rotate trunk
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Internal Oblique Muscle Blood Supply:
superficial and deep superior and inferior epigastric artery and vein; lumbar artery and vein
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Transversus abdominis origin:
internal surface of 7th - 12th costal cartilages, thoracolumbar fascia, iliac crest, lateral third of inguinal ligament
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Transversus abdominis Insertion:
linea alba with aponeurosis of internal oblique, pubic crest, and pectin pubis via conjoint tendon
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Transversus abdominis Innervation:
thoracoabdominal anterior rami of inferior six thoracic nerves and first lumbar nerve
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Transversus abdominis Action:
compresses and supports abdominal viscera
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Transversus abdominis blood supply:
superficial and deep inferior epigastric artery and vein; lumbar artery and vein
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Psoas Muscle Origin:
transverse processes of lumbar vertebrae; sides of bodies T12-L5 and the intervening intervertebral discs
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Psoas Muscle Insertion:
by a strong tendon to lesser trochanter of femur
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Psoas Muscle Innervation:
lumbar plexus via anterior branches of nerves L2-L4
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Psoas Muscle Action:
acting inferiorly with iliacus → flexes thigh
action superiorly → flexes vertebral column laterally used to balance trunk while sitting
acts inferiorly with iliacus to flex trunk
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Psoas Muscle Blood Supply:
Lumbar artery and vein
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Quadratus Lumborum Origin:
medial half of inferior border of 12th rib and tips of lumbar transverse processes
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Quadratus Lumborum Insertion:
iliolumbar ligament and internal lip of iliac crest
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Quadratus Lumborum Innervation:
Anterior Branches of T12 and L1-L4 nerves
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Quadratus Lumborum Action:
extends and laterally flexes vertebral column fixes 12th rib during inspiration
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Quadratus Lumborum Blood Supply:
Lumbar artery and vein
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Iliacus Muscle Origin:
superior 2/3 of iliac fossa, ala of scrum, and anterior sacroiliac ligaments
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Iliacus Muscle Insertion:
lesser trochanter of femur and shaft inferior to it, and to psoas major tendon
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Iliacus Muscle Innervation:
Femoral Nerve (L2-L4)
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Iliacus Muscle Action:
flexes thigh and stabilizes hip joint, acts with psoas major
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Iliacus Muscle Blood Supply
Lumbar artery and vein
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