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Front Trunk Muscles

Muscles of the thorax, abdomen, and pelvis

TermDefinition
External Abdominal Oblique Origin: ribs 5-12; Insertion: linea alba, iliac crest, pubis; Action: compresses abdominal wall, laterally rotates trunk
Internal Abdominal Oblique Origin: inguinal ligament, iliac crest; Insertion: linea alba, ribs 10-12; Action: compresses abdominal wall, laterally rotates trunk
Transvers Abdominal Origin: inguinal ligament, iliac crest, ribs 7-12; Insertion: linea alba, crest of pubis; Action: compresses abdominal wall, laterally rotate trunk
Rectus Abdominis Origin: crest of pubis, symphysis pubis; Insertion: cartilages of ribs 5-7, xiphoid process; Action: flexes vertebral column, compresses abdominal wall
Serratus Anterior Origin: ribs 1-8; Insertion: vertebral border and inferior angle of scapula; Action: abducts scapula (moves scapula away from spinal column)
External Intercostals Origin: inferior border of a rib; Insertion: superior border of rib below; Action: elevates ribs (increases volume in thorax)
Internal Intercostals Origin: inferior border of a rib; Insertion: superior border of rib below; Action: depresses ribs (decreases volume in thorax)
Diaphragm Origin: xiphoid process, lower ribs, upper lumbar vertebrae; Insertion: central tendon; Action: inspiration (contraction), expiration (relaxation)
Created by: koalas2013
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