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关于报警集成电路的,或者船舶报警的都行,感激不尽。... 关于报警集成电路的,或者船舶报警的都行,感激不尽。 展开
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Adrenocortical and Adrenomedullary Homologs in Eight
Species of Adult and Developing Teleosts: Morphology,
Histology, and Immunohistochemistry

Morphology, histology, and immunohistochemistry of
the adrenocortical and adrenomedullary homologs (adrenal
glands) of the following developing and adult teleosts
were examined: Salmoniformes—Oncorhynchus mykiss
(rainbow trout), Salmo trutta fario (brown trout), Coregonus
lavaretus (white fish); Cyprinodontiformes—Gambusia
affinis (mosquito fish). Perciformes—Dicentrarchus
labrax (sea bass), Sparus aurata (sea bream), Diplodus
sargus (white bream), Oblada melanura (saddled bream).
The anatomical relationships of the gland with the renal
system and venous vessels were also noted. In adults of
all species steroidogenic and catecholaminergic chromaffin
cells were found in the head kidney,which is
pronephric in origin and subsequently transformed into
a hematopoietic lymphatic organ. In Perciformes, chromaffin
cells are distributed around the anterior and
posterior cardinal veins and ducts of Cuvier; in Salmoniformes,
around the posterior cardinal veins and in the
hematopoietic tissue; and in G. affinis, around the ducts
of Cuvier and posterior cardinal veins, while a few are
visible also around the sinus venosus. In Perciformes and
Salmoniformes, numerous chromaffin cells are also present
in the posterior kidney, derived from the opisthonephros,
in contact with the caudal vein. Steroidogenic cells
are always confined to the head kidney. During development
chromaffin and steroidogenic cells appear early
after hatching in the pronephric kidney, at the level of the
ducts of Cuvier and of the cephalic part of the posterior
cardinal veins. Later, chromaffin cells in Perciformes reach the anterior cardinal veins, and subsequently, in
both Perciformes and Salmoniformes, they reach the
developing posterior kidney. Their localization along the
posterior kidney is still in progress about 4 months after
hatching and is completed about a year after hatching.
These findings support the concept that the structure of
the adrenal gland in teleosts is intermediate between that
of the other actinopterygians and that of tetrapods. The
development differs from that of tetrapods in that it
occurs mainly in the pronephros and only later do
chromaffin cells reach the opisthonephric kidney.
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