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The Pituitary Gland of the Roach Leuciscus rutilus
Author(s) -
Båge Gertrud,
Ekengren Bo,
Fernholm Bo,
Fridberg Gunnar
Publication year - 1974
Publication title -
acta zoologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.414
H-Index - 37
eISSN - 1463-6395
pISSN - 0001-7272
DOI - 10.1111/j.1463-6395.1974.tb00194.x
Subject(s) - biology , axon , cell type , golgi apparatus , pituitary gland , anatomy , basement membrane , rutilus , microbiology and biotechnology , cell , endoplasmic reticulum , endocrinology , hormone , biochemistry , fishery , fish <actinopterygii>
Three endocrine cell types were recognized in the proximal pars distalis (PPD) of the roach, Leuciscus rutilus , by electron microscopy. Two of these cell types are basophilic and assumed to be gonadotropic. The third cell type is acidophilic and its similarity to somatotropic (STH) cells is evident. Green fluorescent cells corresponding to cells with dense core vesicles of about 85 nm are scattered between the PPD and the proximal neurohypophysis (PNH). Their possible content of a catecholamine was demonstrated with microspectrofluorometric analyses. Four axon types with granules 65, 81, 110 and 137 nm in average diameter terminate at the basement membrane. Only fibers with granules of 81 nm enter the PPD to make synapses with the STH cells. Extensions of the basement membrane are continuous with the perivascular space and penetrate the endocrine tissue. It is postulated that axon terminals on the basement membrane are functionally equivalent to synaptic contacts on the endocrine cells. Axon type 4 has granules which in sizes correspond to those of cells in lateral and ventrolateral parts of the nucleus lateralis tuberis (NLT). A similar correlation is possible between axon type 3 and other cells in the NLT. This is in accordance with earlier conclusions of a regulation of the gonadotropic cells from the lateral (posterior) parts of the NLT.