Why are our abdominal muscles split into sections or “packs” rather than being one smooth piece?

Question

Why are our abdominal muscles split into sections or “packs” rather than being one smooth piece?

In: Biology

Answer 1

Another answer could be; We inherited them from the muscle blocks used by early tetrapods (And their Fish ancestors) to swish their bodies side to side for swimming. The muscle blocks of early chordates (like pikaia) are called myomeres and are homologous to our blocks!