A light- and electron-microscopic study of the pineal complex of the ammocoete larva of the southern lamprey Geotria australis

Meyer-Rochow, V B; Stewart, D

Meyer-Rochow, V B; Stewart, D.

Afiliação

Meyer-Rochow, V B; s.af
Stewart, D; University of the West Indies, Kingston St. Andrew, Jamaica..

Microsc. electron. biol. celular ; 16(1): 69-85, 1992 Jun.

Article em Es | LILACS-Express | BINACIS | ID: biblio-1165243

Biblioteca responsável: AR1.1

Localização: [{"text": "AR1.1"}]

ABSTRACT

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 / AR Base de dados: BINACIS Idioma: En / Es Revista: Microsc. Electron. Biol. Celular / Microsc. electron. biol. celular Ano de publicação: 1992 Tipo de documento: Article País de publicação: Argentina

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