A light- and electron-microscopic study of the pineal complex of the ammocoete larva of the southern lamprey Geotria australis
Microsc. electron. biol. celular
; 16(1): 69-85, 1992 Jun.
Article
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LILACS-Express
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| ID: biblio-1165243
Biblioteca responsável:
AR1.1
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ABSTRACT
The pineal complex of larval Geotria australis lampreys has been examined by light- and electron-microscopy. The complex consists of a pineal organ and a smaller parapineal organ, the former being situated dorsal to the latter. It is concluded that the pineal organ is a functioning photoreceptor, with neural and endocrine output. The parapineal appears to be a more basic neuroendocrine organ without photosensory capability. Day-night comparisons of the pineal complex show no obvious differences in ultrastructure; this could be related to the chronobiological role of the complex as a constant monitor of ambient light levels, rather than a mere visual receptor that changes its sensitivity at night.
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Coleções:
06-national
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AR
Base de dados:
BINACIS
Idioma:
Es
Revista:
Microsc. electron. biol. celular
Ano de publicação:
1992
Tipo de documento:
Article
País de publicação:
Argentina