[Multifunctional morphology of the chick chorioallantoic membrane]

Area of Science:

• Developmental biology
• Comparative anatomy
• Histology

Context:

• The chicken chorioallantoic membrane (CAM) is a transient extraembryonic organ crucial for avian development.
• Understanding CAM structure-function relationships provides insights into embryonic physiology and adaptation.

Purpose:

• To detail the morphological and ultrastructural development of the chicken chorioallantoic membrane from day 7 to 20 of incubation.
• To elucidate the CAM's roles in gas exchange, calcium transport, and water-salt balance.

Summary:

• The chicken chorioallantoic membrane (CAM) fully forms by mid-embryogenesis, integrating chorionic epithelium, mesoderm, and allantoic epithelium.
• Morphometric analysis reveals specialized vascular architecture for filtration and gas exchange, alongside ultrastructural adaptations in epithelial cells for active calcium transport and water-salt balance.

Impact:

• Provides a detailed ultrastructural understanding of a key avian embryonic organ.
• Highlights the CAM's multifunctional roles in supporting rapid embryonic growth and physiological homeostasis.