19 - Case study of a subscapular artery trifurcation

Poster Board Number: 19
There are separate poster presentation times for odd and even posters.
Odd poster #s – first hour
Even poster #s – second hour

Co-authors:

Helder Pimenta - Universidade do Estado do Amazonas; Camilly Batalha - Universidade do Estado do Amazonas; Ketholyn Bespalhuk - Universidade do Estado do Amazonas; Karina Pessoa - Universidade do Estado do Amazonas; Isabele Bicharra - Universidade do Estado do Amazonas; Daianny Brandão - Universidade do Estado do Amazonas; Carlos Castro - Universidade do Estado do Amazonas; Matheus Clos - Universidade do Estado do Amazonas; Marcela de Azevedo - Universidade do Estado do Amazonas; Carla de Medeiros - Universidade do Estado do Amazonas; Rafael de Oliveira - Universidade do Estado do Amazonas; Francisco de Sales Filho - Universidade do Estado do Amazonas; Mariana Ferreira - Universidade do Estado do Amazonas; Hélio Fontinelle Neto - UFAM; Giovane Gama - Universidade do Estado do Amazonas; Mariana Guimarães - Universidade do Estado do Amazonas; Matheus Lopes - Universidade do Estado do Amazonas; Matheus Máximo - Universidade do Estado do Amazonas; Ianê Martins - Universidade do Estado do Amazonas; Thiago Martins - Universidade do Estado do Amazonas; Agatha Azedo - Universidade do Estado do Amazonas; Maria Miranda - FAMETRO; Julia Paoleschi - Universidade do Estado do Amazonas; Júlia Moraes - Universidade do Estado do Amazonas; Danilo Reis - Universidade do Estado do Amazonas; Eliza Ribeiro - Universidade do Estado do Amazonas; Maria Luiza Schneider - Universidade do Estado do Amazonas; Adam Silva - Universidade do Estado do Amazonas; Samira Silva - Universidade do Estado do Amazonas; jasmine Walker - UFAM

Abstract Body : The arterial supply to the lateral chest wall is provided by branches of the axillary artery (AA), an artery that is subdivided into 3 parts. The first part refers from the lateral edge of the first rib to the medial edge of the pectoralis minor muscle, while the second part is posterior and the third part lateral to this muscle. Among the arteries emitted by axillary artery the Subscapular is the branch of larger diameter and shorter length, presenting a final bifurcation into the circumflex artery of the scapula, a component of the anastomoses of the posterior region of the scapula, and into the thoracodorsal artery, responsible for supplying the latissimus dorsi muscle.
Still regarding the anatomical variation in the branches originating from the AA, when it comes to the lateral thoracic artery arising as a branch of the subscapular artery, there is an incidence rate of approximately 3.9% (LOUKAS et al, 2013). In this way, the subscapular artery generates its terminal branches described in the literature (thoracodorsal artery and circumflex artery of the scapula) and presents the origin of the lateral thoracic artery, performing a trifurcation.Therefore, this article aims to report an anatomical variation in the origin of the lateral thoracic artery of a male individual, focusing on the anatomical explanation of the findings.
A routine dissection was performed on a male cadaver, belonging to the Anatomy Laboratory of the School of Health Sciences.It was observed that the lateral thoracic artery, usually described as a branch of the second portion of the axillary artery, originates as an extra branch of the subscapular artery, together with the thoracodorsal and circumflex arteries of the scapula.
Some of the variations of the axillary artery refer to the fusion of two or more branches into common trunks or even branches emerging from different points than expected, such as the lateral thoracic artery originating from the subscapularis instead of the second part of the axillary artery Fact consistent with Brilakis et al. (2023) when stating that it is common for the lateral thoracic artery to arise from the subscapularis or one of its terminal branches. Furthermore, the variability of the axillary artery is greater in the third part followed by the second, with the first part being highly constant (BRILAKIS et al., 2023). Thus, the subscapular artery, in addition to being the largest branch of the axillary artery, is also the most variable (XHAKAZAL; SATYAPAL, 2013).
Furthermore, according to research carried out by Loukas et al. (2014) with 420 cadavers, LTA can be classified into 6 types according to its origin: type I when the LTA comes from the thoracoacromial artery (67.62% of specimens), type II AA (17.02%) , type III of ATD (5%), type IV of SSA (3.93%), in this case work there is type IV.