カイコの蛹化に伴うクチクラ筋付着点の組織学的変化

概要

論文の詳細を見る
Histological changes at the sites of muscle attachment during the larval-pupal transformation of the silkworm, Bombyx mori, were investigated by light and electron microscopy. The muscle-epidermal cell junctions and epidermal cell-cuticle junctions of B.mori are similar to those of other insects : muscle and epidermal cells come into contact at sawtooth-like structures with numerous desmosomes. The epidermal cell-cuticle junction has socket-like structures with numerous hemidesmosomes, where muscle attachment fibers originate and traverse the cuticle, reaching the eqicuticle. These basic components of the muscle attachment site do not change during larval-pupal transformation. General larval-pupal apolysis occurs around the time of gut purge, and progresses gradually while the larva is actively spinning a cocoon. By contrast, at the muscle attachment region, the inner layers of the cuticle are not digested by the molting fluid until later, and the pupal cuticle begins to be secreted from the epidermal cells without apolysis of the larval cuticle around the time of completion of cocoon formation. The continued attachment of the epidermal cells and cuticle at the sites of muscle attachment enables the larva to continue the spinning behavior despite the onset of general apolysis.
日本応用動物昆虫学会の論文
1995-02-25