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The morphometric data were analyzed using ImageJ\u00ae\u2010Fiji 1.5 software. The <jats:italic>Tunica intima<\/jats:italic> was composed of endotheliocytes with scarce cytoplasm and ellipsoid nuclei, supported by a collagenous subendothelial stratum. The <jats:italic>Tunica media<\/jats:italic> was composed entirely of fascicles of vascular smooth muscle cells interspersed with bundles of collagen fibers and elastic lamellae, characterizing the aortic medial lamellar unit. The <jats:italic>Tunica adventitia<\/jats:italic> consisted of two distinct sub\u2010layers: the external lamina, which contained the specific vascular\u2010nervous plexus, and the internal lamina, which was composed of dense, unformed connective tissue. In absolute values, the total thickness of the aortic wall, as well as the thickness of the <jats:italic>Tunica media<\/jats:italic>, was significantly less in the aortic bulb than in the ascending aorta. The fibro molecular content of both segments was also analyzed. Thus, 19.1% of the wall in the aortic bulb was composed of vascular smooth muscle cells, 13.9% of elastin, 25.5% of collagen I, and the content of collagen III was 15.6%. The wall of the ascending aorta contained 17.5% vascular smooth muscle cells, 13.8% elastin, 23.5% collagen I, and 15.1% collagen III. The increase in the thickness of the <jats:italic>Tunica media<\/jats:italic> determined the increase in the total wall thickness of the aortic bulb compared to the ascending aorta. Furthermore, the increase in wall thickness observed between the segments analyzed did not affect the relative amount of fibro\u2010cellular elements in each segment.<\/jats:p>","DOI":"10.1002\/ar.70026","type":"journal-article","created":{"date-parts":[[2025,7,31]],"date-time":"2025-07-31T09:15:27Z","timestamp":1753953327000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Morphological and morphometric characterization of the aorta of Brazilian horses (<i>Equus ferus caballus<\/i>, Linnaeus\u20141758): Comparative analysis of the aortic bulb and ascending aorta"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1644-3629","authenticated-orcid":false,"given":"Marcelo Jos\u00e9","family":"B\u00f6ck","sequence":"first","affiliation":[{"name":"Laborat\u00f3rio de Design Anat\u00f4mico\u2014LabDA, Departamento de Morfologia Universidade Federal de Santa Maria  Santa Maria Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-1566-7500","authenticated-orcid":false,"given":"Thiago Jos\u00e9","family":"Fernandez","sequence":"additional","affiliation":[{"name":"Programa de P\u00f3s\u2010Gradua\u00e7\u00e3o em Anatomia dos Animais Dom\u00e9sticos e Silvestres da Faculdade de Medicina Veterin\u00e1ria e Zootecnia Universidade de S\u00e3o Paulo  Sao Paulo Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8326-2123","authenticated-orcid":false,"given":"Vitor Pires","family":"Pereira","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Design Anat\u00f4mico\u2014LabDA, Departamento de Morfologia Universidade Federal de Santa Maria  Santa Maria Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9303-3324","authenticated-orcid":false,"given":"Marcelo Leite","family":"da Veiga","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Morfofisiologia Experimental\u2014LABITEX, Departamento de Morfologia Universidade Federal de Santa Maria  Santa Maria Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3930-3004","authenticated-orcid":false,"given":"Claudia","family":"de Mello Bertoncheli dos Santos","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Anatomia Patol\u00f3gica\u2014Hospital Universit\u00e1rio Universidade Federal de Santa Maria  Santa Maria Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9326-7104","authenticated-orcid":false,"given":"Luciano","family":"de Morais\u2010Pinto","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Design Anat\u00f4mico\u2014LabDA, Departamento de Morfologia Universidade Federal de Santa Maria  Santa Maria Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,7,31]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1136\/heart.84.6.670"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF02484236"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1201\/b15184"},{"volume-title":"Applied veterinary histology","year":"1993","author":"Banks W. 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