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Robert Frysztak, PhD.
Structure of the Human Body
Loyola University Chicago
Stritch School of Medicine
Abdomen Muscle Table
MUSCLE
External oblique
Internal oblique
Pyramidalis
PROXIMAL ATTACHMENT (ORIGIN)
External surfaces of ribs 5–12
DISTAL ATTACHMENT (INSERTION)
Linea alba, pubic tubercle, anterior half of iliac crest
Thoracolumbar fascia, anterior 2/3 of Inferior borders of ribs 10–12, linea iliac crest, lateral half of inguinal alba, pubis via conjoint tendon
ligament
Body of pubis, anterior to rectus Linea alba
abdominis
MAIN ACTIONS
BLOOD SUPPLY
MUSCLE GROUP
Ventral rami of six inferior thoracic nerves
Compresses and supports abdominal Superior and inferior epigastric viscera, flexes and rotates trunk
arteries
Abdominal wall
Ventral rami of six inferior thoracic and first lumbar nerves
Compresses and supports abdominal Superior and inferior epigastric and viscera, flexes and rotates trunk
deep circumflex iliac arteries
Abdominal wall
Iliohypogastric nerve
Tenses linea alba
Abdominal wall
Ventral rami of six inferior thoracic nerves
Flexes trunk, compresses abdominal Superior and interior epigastric viscera
arteries
Abdominal wall
Abdominal wall
Inferior epigastric artery
Rectus abdominis
Pubic symphysis, pubic crest
Transversus abdominis
Internal surfaces of costal cartilages Linea alba with aponeurosis of 7–12, thoracolumbar fascia, iliac internal oblique, pubic crest, and crest, lateral third of inguinal pecten pubis via conjoint tendon
ligament
Ventral rami of six inferior thoracic and first lumbar nerves
Compresses and supports abdominal Deep circumflex iliac and inferior viscera
epigastric arteries
Diaphragm
Xiphoid process, lower six costal cartilages, L1–L3 vertebrae
Phrenic nerve
Draws central tendon down and forward during inspiration
Pericardiacophrenic, musculophrenic, Posterior abdominal wall
superior and inferior phrenic arteries
Iliacus
Lesser trochanter of femur and shaft Superior 2/3 iliac fossa, ala of inferior to it, and to psoas major Femoral nerve
sacrum, anterior sacro‐iliac ligaments
tendon
Flexes hip and stabilizes hip joint; acts with psoas major
Iliac branches of iliolumbar artery
Psoas major
Transverse processes of lumbar vertebrae, sides of bodies of T12–L5 Lesser trochanter of femur
vertebrae, intervening intervertebral discs
Acting superiorly with iliacus, flexes hip; acting inferiorly, flexes vertebral Lumbar branches of iliolumbar artery Posterior abdominal wall
column laterally; used to balance trunk in sitting position; acting inferiorly with iliacus, flexes trunk
Psoas minor
Quadratus lumborum
Xiphoid process, costal cartilages 5–7
INNERVATION
Converges into central tendon
Ventral rami of first four lumbar nerves
Vertebral margins of T12–L1 vertebrae, corresponding Pectineal line, iliopectineal eminence Ventral rami of first lumbar nerve
intervertebral disc
Medial half of inferior border of 12th Iliolumbar ligament, internal lip of Ventral rami of T12 and first four rib, tips of lumbar transverse iliac crest
lumbar nerves
processes
Flexes pelvis on vertebral column
Lumbar branch of iliolumbar artery
Extends and laterally flexes vertebral column, fixes 12th rib during Iliolumbar artery
inspiration
Posterior abdominal wall
Posterior abdominal wall
Posterior abdominal wall
7/16/2015
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