Microstructure of matrix and mineral components of eggshells from White Leghorn chickens (Gallus gallus)

Journal of Morphology
James E DennisArnold I Caplan

Abstract

The avian eggshell is a composite structure of organic matrix and mineral (calcium carbonate) that is rapidly and sequentially fabricated in the oviduct in <24 hr. The eggshell is an excellent vehicle for the study of biomineralization processes and the role of the organic matrix in the mineral-matrix composite. The organic matrix components of eggshells from White Leghorn chickens (Gallus gallus) were examined by transmission electron microscopy (TEM) and optical microscopy. The mineral phase was analyzed by TEM, scanning electron microscopy (SEM), X-ray compositional microanalysis, and electron diffraction. Ultrastructural examination of the matrices within the calcified eggshell reveals a complex architecture that differs within each of the major zones of the eggshell: the shell membranes, the mammillary zone, the palisade region, and the cuticle. The mammillary layer consists of the calcium reserve assembly (CRA) and crown region, each with a unique substructure. TEM images show that the matrix of the CRA consists of a dense, flocculent material partially embedded within the outer shell membrane (a mostly noncalcified region of the shell). The mantle of the collagen fibers of the shell membranes is rich in polyanions (cupro...Continue Reading

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