Endolymphatic calcium supply for fish otolith growth takes place via the proximal portion of the otocyst.
Cell Tissue Res
; 317(3): 333-6, 2004 Sep.
Article
em En
| MEDLINE
| ID: mdl-15300493
ABSTRACT
The presence of calcium within the utricle of larval cichlid fish Oreochromis mossambicus was analysed by means of energy-filtering transmission electron microscopy. Electron-spectroscopic imaging and electron energy loss spectra revealed discrete calcium precipitations that were more numerous in the proximal endolymph than in the distal endolymph, clearly indicating a decreasing proximo-distal gradient. This decreasing proximo-distal gradient was also present within the proximal endolymph between the sensory epithelium and the otolith. Further calcium particles covered the peripheral proteinaceous layer of the otolith. They were especially pronounced at the proximal surface of the otolith indicating that otolithic calcium incorporation takes place here. Other calcium precipitates accumulated at the macular junctions clearly supporting an earlier assumption according to which the endolymph is supplied with calcium via a paracellular pathway. The present results clearly show that the apical region of the macular epithelium is involved in the release of calcium and that the calcium supply of the otoliths takes place via the proximal endolymph.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Perciformes
/
Membrana dos Otólitos
/
Sáculo e Utrículo
/
Cálcio
/
Endolinfa
Limite:
Animals
Idioma:
En
Revista:
Cell Tissue Res
Ano de publicação:
2004
Tipo de documento:
Article
País de afiliação:
Alemanha