RESUMO -Trinta complexos mamários (60 antímeros) de cadelas adultas, sem raça definida, foram estudados após injeções com substância látex e através de radiografias. Os segmentos anátomo-cirúrgicos arteriais foram identificados e nomeados de acordo com a localização das glândulas mamárias irrigadas, como se segue: as Aa. 4 ª e 5ª perfurantes penetram na mama 1 em 85% dos casos -segmento torácico; 6 ª e 7 ª perfurantes penetram na mama 2 em 48,33% -segmento toraco-abdominal; A. epigástrica cranial superficial tem divisão intraparenquimal em: 1. rr. retrógrados à mama 2 em 51,66% -segmento toraco-abdominal cranial; 2. rr. terminais à mama 3 em 73,32% -segmento toraco-abdominal caudal. A A. epigástrica caudal superficial divide-se em 2 sub-segmentos: 1. seus rr. primários e rr. labiais ventrais à mama 5 e 4 em 96,66% -segmento inguino-abdominal caudal; 2. rr. terminais à mama 3 em 51,66% -segmento inguino-abdominal cranial. Foram evidenciadas anastomoses em 78,33%, todavia estas podem não ser significativas nas mastectomias.Palavras chave: Cães, glândula mamária, artérias, segmentos.ABSTRACT -Thirty mammary complexes (sixty antimers) from cross bred multiparous bitches, were injected with latex and then studied by means of radiology and dissection. The different anatomo-surgical arterial segments thus obtained were identified and designated according to the anatomical zone of irrigation of each mammary gland as follows: 1. Thoracic segment, by means of the fourth and fifth perforant arteries, penetrates the first mammary gland in 85% of the cases; 2. Thoracoabdominal segment, by means of the sixth and seventh perforant arteries, penetrates the second mammary gland in 48.33 % of the cases. This segment can also be divided as follows: 2.1. Retrograde branches of the cranial superficial epigastric artery that penetrates the second mammary gland in about 51.66% of the cases, as the toracoabdominal cranial segment; 2.2. Terminal branches of the last artery penetrate the third mammary gland in 73.32% of the cases, as the toracoabdominal caudal segment. 3. Inguinoabdominal segment may also possess two sub--segments: 3.1. Caudal superficial epigastric artery with primary branches penetrating the fourth mamma and the ventral labial branches, penetrating the fifth mamma in 96.66% of the cases, as inguinoabdomninal caudal segment. 3.2. Terminal branches of the caudal superficial epigastric artery penetrates the third mamma in 51.66% of the cases as inguinoabdominal cranial segment. The anastomosis observed in 78.33% of the cases may not have significance in mastectomy.
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