Answer:
Pubilc bone.
Explanation:
The Rectus Abdominus (-six-packs muscles.) They exist as two -parallel muscles bands separated by connective tissues. They are attached by two separate tendons to the origin the pubic bone. The larger of the two tendon attached the Rectus addominus to the Pubic crest (rim of pubic bone) while the smaller tendon attached it to pubic symphysis. They extends inferiorly from the pubis tabernacle, to insert superiority in the Xiphod process of the sternum and most especially the coastal margins of the 5th ribs , those 6th, 7th and 8th .
They are useful for breathing, labor-push, and lifting of heavy weights. Thus they can appear as 2, 4, 8 to 6 packs etc, when exerting intra-abodominal pressure to engaged in these activities .
