imaginal disc
imaginal disc A group of undifferentiated cells in an insect larva that develops into a specific adult structure. Imaginal discs are derived from the blastoderm. They do not undergo further development until the pupal stage, when they start to differentiate into adult epidermal structures, such as eyes, antennae, and wings, under the control of the hormone ecdysone. The developmental fate of the cells in each disc is determined, and different zones of the disc give rise to particular structures. For example, a fate map of the leg disc of the fruit fly Drosophila can be drawn, consisting of concentric circles of cells; the inner zones develop into the distal leg structures (tarsus and tibia), while the outermost zones give rise to the proximal structures (femur, trochanter, and coxa).
More From encyclopedia.com
Intermediate Filament , intermediate filament Any of numerous microscopic protein fibres that form part of the cytoskeleton of eukaryote cells. With a diameter of about 10 n… Cytoskeleton , The cytoskeleton is responsible for cell shape, motility (movement) of the cell as a whole, and motility of organelles within a cell. There are three… Cell Membrane , cell membrane (plasmalemma, plasma membrane, protoplast) A sheet-like membrane, 7.5–10 nm thick, that forms a selectively permeable barrier enclosing… Microtubule , microtubule A tubular structure, 15–25 nm in diameter, of indefinite length, and composed of subunits of the protein tubulin. It occurs in large numb… Coal Maceral , coal maceral Elementary and microscopic constituent of coal. There are a number of different types. Alginite is formed from algal remains; typical of… Cell , Cell
The cell is the basic unit of a living organism. In multicellular organisms (organisms with more than one cell), a collection of cells that work…
You Might Also Like
NEARBY TERMS
imaginal disc