An electron microscope study of the formation of the ligament ofMytilus edulis andPinctada radiata (original) (raw)
Abstract
An electron microscope study was made of the formation and structure of the inner ligament of_Mytilus edulis_ and_Pinctada radiata_. This part of the ligament is derived from the isthmus cells which are irregular columnar in shape. They exhibit a prominent rough endoplasmic reticulum and a Golgi apparatus, which are concerned with the elaboration of vesicles and granules eventually incorporated into an integral part of the conchiolin.
The crystals arise at the calcification front at the inner surface of the ligament and are enclosed in envelopes. They consist of long, needle-shaped, single aragonite crystals widely dispersed in the ligament.
Although the components of the shell and ligament are similar, differences between them consist of an increased amount of conchiolin, as well as a decrease in the amount, diversity of form, arrangement and growth of the crystals; all probably related to the specialized function of the ligament.
Une étude de microscopie électronique est réalisée sur la formation et la structure du ligament interne de_Mytilus edulis_ et_Pinctada radiata_. Cette partie du ligament est dérivée des cellules isthmiques qui sont de forme cylindrique irrégulière. Elles présentent un ergastoplasme bien développé et un appareil de Golgi, engagé dans l'élaboration de vésicules et granules qui s'incorporent au niveau de la conchioline.
Les cristaux se forment au niveau du front de calcification, à la surface interne du ligament. Ils sont entourés par une enveloppe. Ils se présentent comme des monocristaux d'aragonite, allongés et en forme d'aiguilles, dispersés dans le ligament.
Bien que les constituants de la carapace et du ligament soient identiques, il existe des différences concernant l'augmentation quantitative de conchioline et une diminution en nombre, forme diverse, groupement et croissance des cristaux. Ces différences sont probablement liées à la fonction spécialisée du ligament.
Zusammenfassung
Die Bildung und Struktur des inneren Ligamentes von_Mytilus edulis_ und_Pinctada radiata_ wurden am Elektronenmikroskop untersucht. Dieser Teil des Ligamentes stammt von den Isthmuszellen ab, deren Form unregelmäßig säulenartig ist. Sie zeigen ein vorspringendes, rauhes endoplasmatisches Reticulum und einen Golgiapparat, welche sich mit der Bildung von Bläschen und Granula befassen, die schließlich in einem integralen Teil des Conchiolins eingebaut werden.
Die Kristalle entstehen an der Calcifikationsgrenze an der inneren Oberfläche des Ligamentes und sind in Hüllen eingeschlossen. Sie bestehen aus langen, nadelförmigen, einzelnen Aragonit-Kristallen, die über das ganze Ligament verteilt sind.
Obschon die Bestandteile der Muschel und des Ligamentes gleichartig sind, unterscheiden sich die beiden durch eine erhöhte conchiolinmenge, wie auch durch eine Abnahme der Anzahl der Kristalle, welche verschieden in der Form, in der Anordnung und im Wachstum sind. Dies alles ist vermutlich auf die spezielle Funktion des Ligamentes zurückzuführen.
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Authors and Affiliations
- Department of Histology, The University of Texas Dental Branch, 11025, Houston, Texas, USA
Gerrit Bevelander & Hiroshi Nakahara - The Bermuda Biological Station for Research, Bermuda
Gerrit Bevelander & Hiroshi Nakahara - The University of Connecticut marine Research Laboratory, USA
Gerrit Bevelander & Hiroshi Nakahara
Authors
- Gerrit Bevelander
- Hiroshi Nakahara
Additional information
This investigation was supported (in part) by grant DE-01825, N.I.D.R., U.S.P.H. Service.
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Bevelander, G., Nakahara, H. An electron microscope study of the formation of the ligament of_Mytilus edulis_ and_Pinctada radiata_.Calc. Tis Res. 4, 101–112 (1969). https://doi.org/10.1007/BF02279112
- Received: 29 January 1969
- Issue date: December 1969
- DOI: https://doi.org/10.1007/BF02279112