**Pinopode**
**Definition**
Pinopodes, also known as uterodomes, are small, finger-like projections that appear on the surface of the endometrial epithelial cells during the receptive phase of the menstrual cycle.
**Overview**
Pinopodes develop on the apical surface of the endometrium, typically during the mid-luteal phase, coinciding with the window of implantation. Their formation is regulated by ovarian hormones, primarily progesterone. These structures are believed to play a role in embryo implantation by facilitating adhesion between the blastocyst and the endometrial lining. Pinopodes may also be involved in absorbing uterine fluid to bring the embryo closer to the endometrial surface. Due to their transient presence, pinopodes are considered markers of endometrial receptivity in reproductive medicine.
**Meta Description**
Pinopodes are specialized projections on the endometrial surface that appear during the implantation window, aiding embryo attachment and indicating uterine receptivity.