29832D

29832D
Caption: Chicken eggshell cross section. Shown from left to right in the image - hard mineralized eggshell and inner fibrous membrane. The hard mineralized eggshell contains calcium carbonate (CaCO3) mineral crystals that form many tiny pores in the eggshell. The eggshell inner fibrous membrane is composed of protein fibers (internal and attached to the hard eggshell). Several membranes are found around the embryo of a bird egg. The internal eggshell membrane adheres to the inner surface of the hard eggshell. As the chick develops changes in the eggshell allow the passage of carbon dioxide and oxygen and the release of water vapor by way of the eggshell membranes. Eggshells are the outer covering of hard-shelled eggs and of other eggs with soft outer coats. Eggshell structure varies widely among species. Birds and some reptiles produce hard-shelled eggs. Bird eggshells are composed of a protein matrix lined with mineral crystals, usually calcium carbonate. Most of the eggshell is composed of calcium carbonate crystals (approximately 95%). In the formation of the mineralized eggshell tiny pores develop for additional gas exchange.
Magnification*: x48
Type: SEM
Copyright 2009 Dennis Kunkel Microscopy, Inc.
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