The solid cord of epithelial cells that emerges from the mammary bud and grows down from the primary mammary mesenchyme and into a second stromal compartment, the fat pad precursor, beneath the dermis. [ MP:0013725 ]
术语信息
in female mouse embryos, the primary mammary cord (aka 'mammary sprout') is formed between E15.5 and E16.5; once the primary cord reaches the adipocytes of the fat pad (around E16), it begins to branch in a characteristic dichotomous fashion to form the initial ductal tree
The solid cord of epithelial cells that emerges from the mammary bud and grows down from the primary mammary mesenchyme and into a second stromal compartment, the fat pad precursor, beneath the dermis.