Abdominal Region Flashcards
What are the four quadrants of the abdominal region?
Left upper, right upper, left lower, and right lower
Functions of the abdominal wall
- Protection and stabilization of abdominal contents
- Trunk rotation and flexion
- Maintain and control intra-abdominal pressure for parturition and defecation
- Respiration: opposes diaphragm during exhalation
What are the nine regions/sections?
Right and left: hypochondriac, lumbar, iliac
Epigastric, umbilical, hypogastric
External oblique origin
External surfaces of ribs 5-12
Insertion of external oblique
Linea alba, pubic tubercle, and anterior half of iliac crest
Action of external oblique
Compress and support abdominal viscera; flex and rotate trunk
Innervation of external oblique
Thoraco-abdominal nerves (anterior rami of T7-T11) and subcostal nerve (T12)
Origin of internal oblique
Thoracolumbar fascia, anterior 2/3 of iliac crest, and connective tissue deep to inguinal ligament
Insertion of internal oblique
Inferior borders of ribs 10-12, linea alba, and pubis via conjoint tendon
Action of internal oblique
Compress and support abdominal viscera; flex and rotate trunk
Internal oblique innervation
Thoraco-abdominal nerves (anterior rami of T7-T11) and first lumbar nerve (L1)
Origin of rectus abdominus
Pubic symphysis and pubic crestI
Insertion of rectus abdominus
Xiphoid process and costal cartilages 5-7
Action of rectus abdominus
Flexes trunk, compresses abdominal viscera, stabilizes and controls pelvic tilt
Innervation of rectus abdominus
Thoraco-abdominal nerves (anterior rami of inferior six thoracic nerves)
