Publication: Changes in the ventral dermis and development of iridophores in the anadromous sea lamprey, Petromyzon marinus, during metamorphosis: an ultrastructural study
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Date
1992
Authors
Wright, Glenda M. ; McBurney, Kim M.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
The ultrastructural changes that take place
in the ventral dermisalong with the development of
iridophores were examined in the anadromous sea
lamprey, Petromyzon marinus, during metamorphosis.
There is a disruption of al1 components of the ventral
dermis and a reformation that results in a sturcture
very similar to that prior to metamorphosis. Although
not a dermal component, a layer of iridophores
develops directly beneath the dermis during late
metamorphosis. The dermal endothelium is lost by
mid metamorphosis (stage 4) and the highly organized
collagenous lamellae making up the bulk of the dermis
become disrupted by the migration of fibroblasts into
the region. Many of these fibroblasts are involved in
the degradation of the lamellae. By stage 5 of
metamorphosis some fibroblasts become highly active
collagen synthesizing cuboidal shaped cells that align
to form a layer above the reformed dermal
endothelium. New lamellae are formed by these
cuboidal cells which then divide and migrate into the
lamellae where they assume the characteristic
attenuated appearance of fibroblasts in the adult
dermal lamellae region. Iridophores first appear
during stage 5 directly beneath the dermal
endothelium. Reflecting platelets develop from double
membraned vesicles associated with the Golgi
apparatus. By late metamorphosis, stacks of
trapezoidal shaped platelets fill the cytoplasm of the
iridophores. The significance of the changes in the
dermis during metamorphosis are discussed. This work
is part of a continuing series of studies on the
connective tissues in the anadromous sea lamprey.
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