Origin, insertion, innervation and function of the pyramidalis muscle
Hello there! It’s Matt from Kenhub, and in this tutorial we will discuss the pyramidalis muscle. The pyramidalis muscle is one of the anterior abdominal muscles which make up part of the abdominal wall musculature. They tense the anterior abdominal wall together with the lateral abdominal muscles. The anterior abdominal muscles consists of the pyramidalis and the rectus abdominis.
The pyramidalis muscle is a small triangular-shaped bilaterally located muscle that runs diagonally from the pubis ventral to the insertion of the rectus abdominis muscle and runs within the rectus sheath to the linea alba. It is innervated by the subcostal nerve or the twelfth intercostal nerve. The pyramidalis is a rudimentary muscle and relates to the pouch inside of monotremes such as the hedgehog and the platypus and marsupials such as the koala or kangaroo. Its original function, tensing the linea alba, does not play a role in higher mammals anymore. The pyramidalis muscle is actually not present in all humans.
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