Which endometrial layer is shed during menstruation, while the other layer remains behind?

1. The endometrium consists structurally of two layers: the stratum basalis and the stratum functionalis. 2. The stratum basalis lies adjacent to the myometrium and does not shed during menses. 3. The stratum functionalis is the thicker layer that grows in response to estrogen and progesterone. 4. The stratum basalis and The myometrium are both different figures a reader might guess from memory, but neither matches the specific figure given here. 5. The perimetrium is also incorrect for the same reason: it does not match the specific figure given here. 6. It is only the stratum functionalis that sheds during menstruation. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 27 "The Reproductive System", p.1301-1302 §The Uterus and Cervix_