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EXTERNAL OBLIQUE
O- Lower 8 ribs
I- Xiphoid process, linea alba, pubic tubercle, pucbic crest, iliac crest
N- Lower 6 thoracic nerve and iliohypogastric and ilioinguinal nerve (L1)
A- Supports abdominal component, compresses abdominal component, assists in flexion and rotation of trunk, assists in forced expiration, micturition, defecation, parturition and vomiting
INTERNAL OBLIQUE
O- Lumbar fascia, iliac crest, lateral 2/3 of inguinal ligament
I- Lower 3 ribs and costal cartilages, xiphoid process, linea alba, symphysis pubis
N- Lower 6 thoracic nerve and iliohypogastric and ilioinguinal nerve
A- Supports abdominal components, compresses abdominal components, assists in flexing and rotation of trunk, assists in forced expiration, micturition, defecation, parturition, and vomiting.
TRANSVERSUS
O- Lower 6 costal cartilages, lumbar fascia, iliac crest, lateral third of inguinal ligament
I- Xiphoid process, linea alba, symphysis pubis
N- Lower 6 thoracic nerves, iliohypogastric and ilioinguinal nerves
A- Compresses abdominal components
RECTUS ABDOMINIS
O- Symphysis pubis and pubic crest
I- 5th, 6th and 7th costal cartilage and xiphoid process
N- Lower 6 thoracic nerve
A- Compresses abdominal compartment and flexes vertebral column, accesory muscles for expiration
PYRAMIDALIS
O- Anterior surface of pubis
I- Linea alba
N- 12 thoracic nerve
A- Tenses linea alba
QUADRATUS LUMBORUM
O- Iliolumbar ligament, iliac crest, tips of transverse processes of lower lumbar vertebrae
I- 12th rib
N- Lumbar plexus
A- Fixes 12th rib during inspiration; depresses 12th rib during forced expiration; laterally flexed vertebral column same side
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