What is the characteristics of the basal layer of the endometrium?

The basal layer of the endometrium, known as the stratum basalis, is characterized by its dense, compact structure that contains a rich supply of blood vessels and glands. It serves as the foundation for the functional layer, which undergoes cyclical changes during the menstrual cycle. Unlike the functional layer, the basal layer is not shed during menstruation and plays a crucial role in regenerating the endometrium after each cycle. Additionally, it is composed of stromal cells and connective tissue that support the overall architecture of the endometrium.