Anat- Abdominal Wall Muscles
Terms
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- rectus abdominis: origin
- pubic symphysis and pubic crest
- rectus abdominis: insertion
- xiphoid process and 5th-7th costal cartilages
- rectus abdominis: innervation
- thoracoabdominal nerves and anterior rami of inferior thoracic nerves
- rectus abdominis:action
- flexes trunk and compresses abdominal viscera, stabilizes and controls tilt of pelvis
- rectus abdominis: blood supply
- superficial and deep superior and inferior epigastric artery and vein
- external oblique: origin
- external surfaces of 5th-12th ribs
- external oblique: insertion
- linea alba, pubic tubercle, and anterior half of iliac crest
- external oblique: innervation
- thoracoabdominal nerves and subcostal nerve
- external oblique: action
- compress and support abdominal viscera, flex and rotate trunk
- external oblique: blood supply
- superior and inferior epigastric artery and vein, lumbar artery and vein
- internal oblique: origin
- thoracolumbar fascia, anterior two-thirds of iliac crest, lateral half of inguinal ligament
- internal oblique: insertion
- inferior border of 10th-12th ribs, linea alba, and pubis via conjoint tendon
- internal oblique: innervation
- thoracoabdominal anterior rami of inferior six thoracic nerves; first lumbar nerve
- internal oblique: action
- compress and support abdominal viscera, flex and rotate trunk
- internal oblique: blood supply
- superficial and deep superior and inferior epigastric artery and vein; lumbar artery and vein
- transversus abdominis: origin
- internal surface of 7th-12th costal cartilages, thoracolumbar fascia, iliac crest, lateral third of inguinal ligament
- transversus abdominis: insertion
- linea alba with aponeurosis of internal oblique, pubic crest, and pectin pubis via conjoint tendon
- transversus abdominis: innervation
- thoracoabdominal anterior rami of inferior six thoracic nerves and first lumbar nerve
- transversus abdominis: action
- compresses and supports abdominal viscera
- transversus abdominis: blood supply
- superficial and deep inferior epigastric artery and vein; lumbar artery and vein
- psoas: origin
- transverse processes of lumbar vertebrae; sides of bodies of T12-L5 vertebrae and intervening IV discs
- psoas: insertion
- by a strong tendon to lesser trochanter of femur
- psoas: innervation
- lumbar plexus via anterior branches of nerves L2-L4
- psoas: action
- acting inferiorly with iliacus; flexes thigh, acting superiorly; flexes vertebral column laterally used to balance trunk while sitting, acts inferiorly with iliacus to flex trunk
- psoas: blood supply
- lumbar artery and vein
- quadratus lumborum: origin
- medial half of inferior border of 12th rib and tips of lumbar transverse processes
- quadratus lumborum: insertion
- iliolumbar ligament and internal lip of iliac crest
- quadratus lumborum: innervation
- anterior branches of T12 and L1-L4 nerves
- quadratus lumborum: action
- extends and laterally flexes vertebral column; fixes 12th rib during inspiration
- quadratus lumborum: blood supply
- lumbar artery and vein
- iliacus: origin
- superior two thirds of iliac fossa, ala of scrum, and interior sacroiliac ligaments
- iliacus: insertion
- lesser trochanter of femur and shaft inferior to it, and to psoas major tendon
- iliacus: innervation
- femoral nerves (L2-L4)
- iliacus: blood supply
- lumbar artery and vein