| Namespace | MPheno.ontology | Obsolete | false |
| description | any structural anomaly of the unique club-shaped epithelial structure that develops at the tip of the mammary duct at the onset of puberty (approximately 3 weeks of age in mouse) under the action of circulating hormones; terminal end buds (TEBs) consist of an outer layer of undifferentiated myoepithelial progenitor cells (cap cells), and a multilayered inner core of luminal epithelial cells (body) fated to form the walls of the ductal lumen; both layers have high rates of mitosis, consistent with a motile organ dedicated to ductal morphogenesis; TEBs proliferate, ramify, and actively invade the fad pad to allow the formation of a complex branching structure; this process of branching morphogenesis concludes at about 10-12 weeks of age in mouse, when TEBs have traversed the length of the fat pad and a fully developed ductal tree has formed |
