Morphometry and Frequency of the Pyramidalis Muscle in Adult Humans: A Pyramidalis Muscle’s Anatomical Analysis

The pyramidalis muscle is a small triangular muscle located in the inferior part of the anterior abdominal wall. It can be bilateral, unilateral, duplicated in one or both sides, or also absent, and its incidence and morphometry vary between populations. Moreover, although its function is not well known, there are still few researches describing that it. Therefore, considering the literary scarceness regarding the pyramidalis and the inexistence of morphometric data of such muscle in Brazil, it becomes considerably relevant collecting that data in brazilian people. Thus, this study describes the pyramidalis muscle morphometry in a sample of brazilian population, verifying its dimensions, frequency, bilaterality, unilaterality, and other anatomical variations that may be found. Then, we compare the values obtained with other studies. With it, besides deepening knowledge about pyramidalis' functions, some medical procedures could be done in a more rationalized way, such as abdominal incisions, e.g. Pfannenstiel, once the pyramidalis' can be used as reference to these incisions; and grafts, once the absence of the pyramidalis doesn't cause notable disfunction.