3 Rectus abdominis
4 Serratus magnus
5 External oblique
Rectus Abdominis: From symphysis pubis to cartilages of ribs, from fifth to seventh. Action: Flexes thorax.
Serratus Magnus: From eight upper ribs to scapula—spinal edge, under surface. Action: Draws shoulder blade forward, raises ribs.
External Oblique: From eight lower ribs to iliac crest and ligament to pubis. Action: Flexes thorax.
Pectoralis major Deltoid
CAGE OF THE TORSO
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