What are the Key Histological Features of the Endometrium During Implantation?

The endometrium undergoes significant changes to support implantation.

- Endometrial Receptivity: During the secretory phase of the menstrual cycle, the endometrium becomes receptive to the blastocyst. This is characterized by the presence of pinopodes, which are small, finger-like projections that absorb uterine fluid and bring the blastocyst closer to the endometrial surface.
- Decidualization: The stromal cells of the endometrium transform into decidual cells, which provide nutritional and structural support to the implanting embryo.