Abdomen Flashcards
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
Thoraco-abdominal and subcostal nerves (anteiror rami of T7-T12 Spinal Nerves)
External Oblique action
Compress and support abdominal viscera, flex and rotate trunk
Internal Oblique origin
Thoracolumbar fascia, anterior two third of illiac crest, and connective tissue deep to linguinal ligamen
Internal Oblique insertion
internal borders off 10th-12th ribs, linea alba, and pubis via conjoint tendon
Internal Oblique innervation
Thoraco-abdominal nerves (anteiror rami of T7-T11 Spinal Nerves) subcostal and first lumbar nerve
Internal Oblique action
Compress and support abdominal viscera, flex and rotate trunk
Transveres Abdomninus origin
internal surfaces of 7th-12th costal cartilages, thoracolumbar fascia, iliac crest, and connective tissue deep to linguinal ligament
Transveres Abdomninus insertion
Linea alba with aporneurosis of internal oblique, pubic crest, and pubis via conjoint tendon
Transveres Abdomninus innervation
Thoraco-abdominal nerves (anteiror rami of T7-T11 Spinal Nerves) subcostal and first lumbar nerve
Transveres Abdomninus action
compressess and supports abdominal viscera
Rectus Abdominus origin
pubic symphasis and pubic crest
Rectus Abdominus insertion
xiphiod process and 5th-7th costal cartilages
Rectus Abdominus innervation
Thoraco-abdominal and subcostal nerves (anteiror rami of T7-T12 Spinal Nerves)
Rectus Abdominus action
flexes trunk (lumbar vertebrae) and compressess abdominal viscera; stabalizes and controls tilt of pelvis (antilordosis)
Iliacus origin
supeiror 2/3 of iliac fossa, ala of sacrum, and anteior sacroiliac ligaments
Iliacus insertion
tendon of psoas major, lesser trochanter of femur, and shaft of femur distal (inferior) to it
Iliacus innervation
femoral nerve (L2-L4)
Iliacus action
femoral nerve (L2-L4)
Psoas Major origin
sides of T12-S1 vertebrae and intervening IV discs between them; transverse processes of all lumbar vertebrae
Psoas Major insertion
by strong tendon to lesser trochanter of femur
Psoas Major innervation
lumbar plexus vis anterior branches of nerves (L2-L4)
Psoas Major action
acting inferiorly with iliacus, flexes thigh; acting superiorly, flexes vertebral column laterally to balance the trunk; when sitting, acts inferiorly with iliacus to flex trunk
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 verteral column; fixes 12th rib during inspiration
