Robert Frysztak, PhD. Structure of the Human Body Loyola University Chicago Stritch School of Medicine

Abdomen Muscle Table PROXIMAL ATTACHMENT DISTAL ATTACHMENT MUSCLE INNERVATION MAIN ACTIONS BLOOD SUPPLY MUSCLE GROUP (ORIGIN) (INSERTION)

Linea alba, pubic tubercle, anterior Ventral rami of six inferior thoracic Compresses and supports abdominal Superior and inferior epigastric External oblique External surfaces of ribs 5–12 half of nerves viscera, flexes and rotates trunk arteries , anterior 2/3 of Inferior borders of ribs 10–12, linea Ventral rami of six inferior thoracic Compresses and supports abdominal Superior and inferior epigastric and Internal oblique iliac crest, lateral half of Abdominal wall alba, via conjoint tendon and first lumbar nerves viscera, flexes and rotates trunk deep circumflex iliac arteries Body of pubis, anterior to rectus Pyramidalis Iliohypogastric nerve Tenses linea alba Inferior epigastric artery Abdominal wall abdominis Ventral rami of six inferior thoracic Flexes trunk, compresses abdominal Superior and interior epigastric Rectus abdominis Pubic , pubic crest Xiphoid process, costal cartilages 5–7 Abdominal wall nerves viscera arteries Internal surfaces of costal cartilages Linea alba with of 7–12, thoracolumbar fascia, iliac Ventral rami of six inferior thoracic Compresses and supports abdominal Deep circumflex iliac and inferior Transversus abdominis internal oblique, pubic crest, and Abdominal wall crest, lateral third of inguinal and first lumbar nerves viscera epigastric arteries pecten pubis via conjoint tendon ligament Xiphoid process, lower six costal Draws central tendon down and Pericardiacophrenic, musculophrenic, Diaphragm Converges into central tendon Phrenic nerve Posterior abdominal wall cartilages, L1–L3 vertebrae forward during inspiration superior and inferior phrenic arteries Lesser trochanter of femur and shaft Superior 2/3 iliac fossa, ala of Flexes hip and stabilizes hip ; Iliacus inferior to it, and to psoas major Femoral nerve Iliac branches of iliolumbar artery Posterior abdominal wall , anterior sacro‐iliac acts with psoas major tendon

Acting superiorly with iliacus, flexes Transverse processes of lumbar hip; acting inferiorly, flexes vertebral vertebrae, sides of bodies of T12–L5 Ventral rami of first four lumbar Psoas major Lesser trochanter of femur column laterally; used to balance Lumbar branches of iliolumbar artery Posterior abdominal wall vertebrae, intervening intervertebral nerves trunk in sitting position; acting discs inferiorly with iliacus, flexes trunk

Vertebral margins of T12–L1 Psoas minor vertebrae, corresponding , iliopectineal eminence Ventral rami of first lumbar nerve Flexes on Lumbar branch of iliolumbar artery Posterior abdominal wall Medial half of inferior border of 12th Extends and laterally flexes vertebral Iliolumbar ligament, internal lip of Ventral rami of T12 and first four Quadratus lumborum rib, tips of lumbar transverse column, fixes 12th rib during Iliolumbar artery Posterior abdominal wall iliac crest lumbar nerves processes inspiration

7/16/2015