TEMa (SBM AMB) Practice Questions - Exame De Suficiência Para Obtenção Do Título De Especialista Em Mastologia (TEMa - SBM AMB) Exam

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During human embryogenesis, mammary gland development begins around the fifth to sixth week of gestation with the formation of the milk line (linha láctea / crista mamária). What is the embryonic origin and anatomical fate of this structure?

It arises from ectodermal thickening extending from the axilla to the inguinal region, normally regressing except in the fourth intercostal space where the pectoral breast develops It develops entirely from the lateral plate mesoderm along the ventral midline and fails to regress in normal development It originates from endodermal foregut outgrowths extending bilaterally along the midclavicular lines into the pelvic brim It derives from neural crest cell migration into the primitive chest wall, giving rise exclusively to stromal elements

Correct Answer:

It arises from ectodermal thickening extending from the axilla to the inguinal region, normally regressing except in the fourth intercostal space where the pectoral breast develops

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