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Morphometry and Frequency of the Pyramidalis Muscle in Adult Humans
Author(s) -
Kogima Rudolph Octaviano,
Simões Pedro,
Paula Santos Lesley Miriam,
Hojaij Flávio,
Andrade Mauro,
Akamatsu Flávia Emi,
Jacomo Alfredo Luiz
Publication year - 2018
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.2018.32.1_supplement.513.8
Subject(s) - cadaver , anatomy , population , biology , medicine , environmental health
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. The study comprised 21 cadavers of individuals older than 18 years (SVOC/FMUSP). Each one of them was dissected, exposing the pyramidalis muscles (if present), without releasing it from its original place, allowing to take photos for posterior measuring (pyramidalis medial border length and width in its origin/base) in image processing program Image. Out of the 21 cadavers, 7 were females and 14 males. The pyramidalis muscle was present bilaterally in 16/21 (76.19%) of the cadavers, present unilaterally in 2/21 (9.52%) and absent in 3/21 (14.28%). The size of the medial border of the left and right‐sided pyramidalis ranged from 3.50–10.67 cm; and the size of the pyramidalis basis' length ranged from 0.91–2.93 cm in the left side, and from 1.10–2.50 cm in the right side. The mean size of the medial border of the pyramidalis was 6.30 ± 1.97 cm in the left side and 6.69 ± 2.07 cm in the right side. The mean size of the pyramidalis basis' width was 1.99 ± 0.23 cm in the left side and 1.90 ± 0.35 cm in the right side. We found out that, in this sample, males presented longer and wider Pyramidalis than females. Besides that, the incidence of the pyramidalis in this sample of the brazilian population was one of the lowest, comparing to other populations . And, lastly, comparing the dimensions in women, in the present study the pyramidalis was wider and usually longer than in women from other populations . This abstract is from the Experimental Biology 2018 Meeting. There is no full text article associated with this abstract published in The FASEB Journal .