Name the muscular and glandular layers of human uterus. Which one of these layers undergoes cyclic changes during menstrual cycle? Name hormone essential to maintain this cycle.

Explanation

**Step-by-Step Solution:**

1. **Identify the Layers of the Uterus:**
- The human uterus consists of three main layers:
- **Endometrium:** This is the innermost layer that lines the uterus. It is glandular in nature and is responsible for the implantation of the fertilized ovum.
- **Myometrium:** This is the middle layer, which is muscular. It is responsible for the contractions of the uterus during childbirth and menstrual cycles.
- **Perimetrium (or Exometrium):** This is the outermost layer that provides a protective covering to the uterus.

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