Term | Definition |
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) |