- bud dilation
The process in which a branch bud increases radially. A branch bud is the initial area of outgrowth in the formation of a new branch.
- epithelial cell type specification, open tracheal system
Allocation of epithelial cells within each migrating branch in an open tracheal system to distinct tracheal cell fates. During the migration phase each branch forms a well-defined number of cell types (including fusion cells, terminal cells and branch cells) at precise positions.
- bronchiole morphogenesis
The process in which a bronchiole is generated and organized. A bronchiole is the first airway branch that no longer contains cartilage; it is a branch of the bronchi.