Abdominal muscle origin

Question 1

Rectus Abdominis origin

Answer 1

Pubic symphysis of the pelvis

Question 2

External Oblique origin

Answer 2

External surface of ribs 4–12

Question 3

Internal Oblique origin

Answer 3

Anterior two-thirds of the iliac crest of the pelvis and thoracolumbar fascia

Question 4

transverse abdominis origin

Answer 4

Ribs 7–12, anterior two-thirds of the iliac crest of the pelvis, and thoracolumbar fascia

Question 5

diaphragm origin

Answer 5

Costal part: Inner surfaces of the cartilages and adjacent bony regions of ribs 6–12
Sternal part: Posterior side of the xiphoid process
Crural (lumbar) part: (1) Two aponeurotic arches covering the external surfaces of the quadratus lumborum and psoas major and (2) right and left crus, originating from the bodies of L1–L3 and their intervertebral discs