- tube formation
Creation of the central hole of a tube in an anatomical structure through which gases and/or liquids flow.
- neural tube formation
The formation of a tube from the flat layer of ectodermal cells known as the neural plate. This will give rise to the central nervous system.
- regulation of tube diameter, open tracheal system
Ensuring that a tube in an open tracheal system is of the correct diameter. When primary branches form their lumens are small (less than 2 micrometers) in caliber and must undergo regulated expansion during larval life to reach their mature size.
- germ tube
The slender tubular outgrowth first produced by most spores in germination.
- pollen tube
A tubular cell projection that is part of a pollen tube cell and extends from a pollen grain.