What does imaginal disc mean?

Here's a list of possible definitions for the term imaginal disc:


Wiktionary

  1. imaginal disc(Noun)

    Any of several pairs of discs within the body of a larva that become part of the outside during pupal transformation

Freebase

  1. Imaginal disc

    An imaginal disc is one of the parts of a holometabolous insect larva that will become a portion of the outside of the adult insect during the pupal transformation. Contained within the body of the larva, there are pairs of discs that will form, for instance, the wings or legs or antennae or other structures in the adult. The role of the imaginal disc in insect development was first elucidated by Jan Swammerdam. During the pupal stage, many larval structures are broken down, and adult structures, including the discs, undergo rapid development. Each disc everts and elongates, with the central portion of the disc becoming the distal part of whichever appendage, wing, leg, antenna, etc., it is forming. During the larval stage, the cells in the growing disc appear undifferentiated, but their developmental fate in the adult is already determined. The experiment that demonstrates this developmental commitment is to take an imaginal disc from a third instar larva, about to undergo pupation, and subdivide it and culture it in the body of a younger larva. Discs can be continuously cultured this way for many larval generations. When such a cultured disc is eventually implanted in the body of a larva that is allowed to pupate, the disc will develop into the structure it was originally determined to become. That is, an antenna disc can be cultured this way and will, almost always, become an antenna when final development is triggered by pupation.

Numerology

  1. Chaldean Numerology

    The numerical value of imaginal disc in Chaldean Numerology is: 3

  2. Pythagorean Numerology

    The numerical value of imaginal disc in Pythagorean Numerology is: 2



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