Histological Changes in the Cat Placenta Throughout Gestation.

Area of Science:

• Reproductive Biology
• Developmental Biology
• Histology

Background:

• Feline placental organogenesis is not fully described, particularly during less-studied developmental stages.
• Understanding placental development is crucial for reproductive success and efficiency.

Purpose of the Study:

• To provide a detailed histological description of cat placental organogenesis.
• To analyze morphometric variables and their relationship with gestational age.
• To elucidate temporal modifications in placental structures.

Main Methods:

• Histological analysis of 37 feline placentas across various gestational ages.
• Morphometric measurements of placental width, thickness, lamellar characteristics, and decidual cells.
• Ultrastructural analysis of term placental tissue.

Main Results:

• Fetal length increased significantly from 31 days post-coitum (dpc).
• Placental thickness increased until 39 dpc, with lamellae becoming more abundant, parallel, longer, and narrower.
• Trophoblast cell fusion and decidual cell incorporation into lamellae were observed, with changes in their number, size, and ploidy over gestation.

Conclusions:

• The study describes temporal modifications in feline placental lamellar, trophoblastic, and decidual features.
• These findings enhance knowledge of feline placental morphogenesis.
• The results may aid in understanding mechanisms of placental development and efficiency.