Pyramidalis muscle
Pyramidalis muscle is a small triangular muscle, anterior to the rectus abdominis muscle, and contained in the rectus sheath. Origin: pubic symphysis and pubic crest. Insertion: linea alba. Nerve supply: Subcostal nerve (T12). Actions: tensing the linea alba. When performed alone, the tensing of the linea alba by the pyramidalis muscle serves no important purpose….