Chapter 4 – Reproductive Cycles
- Read Coad, Anatomy & Physiology for Midwives, 4th edition, chapter 4.
- Write out your answers to Coad, Chapter Case Study, page 83.
- Create a Coad “Chapter 4 Study Sheet.” Include the following:
Learning Goals
□ Describe oogenesis (egg development).
□ Explain follicular development.
□ Describe ovulation.
□ Explain the menstrual cycle in a non-pregnant woman.
□ Explain hormonal regulation of the reproductive cycle.
□ Describe how hormones affect the reproductive tract.
□ Relate hormonal changes to fertility.
□ Explain how reproductive cycle knowledge applies to conception, natural family planning, contraception, and infertility treatment.
Essential Vocabulary
Ovarian Cycle
- Oogenesis
- Oocyte
- Ovum
- Follicle
- Primordial follicle
- Primary follicle
- Secondary follicle
- Graafian follicle
- Ovulation
- Corpus luteum
- Corpus albicans
Menstrual Cycle
- Follicular phase
- Ovulation
- Luteal phase
- Menstruation
- Proliferative phase
- Secretory phase
Hormones
- GnRH
- FSH
- LH
- Estrogen
- Progesterone
- Inhibin
Draw
1. The Ovarian Cycle
Sketch the progression:
Primordial follicle
↓
Primary follicle
↓
Secondary follicle
↓
Mature (Graafian) follicle
↓
Ovulation
↓
Corpus luteum
↓
Corpus albicans (if no pregnancy)
2. Hormone Graph
Draw a simple graph showing:
- FSH
- LH
- Estrogen
- Progesterone
across a 28-day cycle.
This is probably the single most valuable diagram in the chapter.
3. Uterine Cycle
Draw three phases:
- Menstruation
- Proliferative phase
- Secretory phase
Structures & Concepts I Must Know
| Structure | Function |
|---|---|
| Ovary | Produces oocytes and hormones |
| Follicle | Develops and nourishes the oocyte |
| Corpus luteum | Produces progesterone after ovulation |
| Endometrium | Site of implantation |
| Cervix | Changes with hormone levels |
| Cervical mucus | Changes throughout the cycle |
Processes I Must Understand
- Oogenesis
- Follicle maturation
- Ovulation
- Hormonal feedback
- Endometrial changes
- Fertilization timing
- Implantation preparation
Rather than memorizing isolated facts, be able to explain what happens next at every stage.
Midwifery Connections
| Concept | Why a Midwife Cares |
|---|---|
| Ovulation | Timing conception |
| Cervical mucus | Fertility awareness |
| Progesterone | Supports implantation and early pregnancy |
| Corpus luteum | Maintains pregnancy before the placenta takes over |
| Endometrium | Implantation and placental development |
| Menstrual history | Dating pregnancy and identifying abnormalities |
| Hormonal cycles | Infertility evaluation and patient education |
Clinical Connections
Be able to explain:
- Why ovulation does not always occur on day 14.
- Why the luteal phase is generally more consistent than the follicular phase.
- How basal body temperature changes after ovulation.
- Why cervical mucus becomes clear and stretchy near ovulation.
- Why progesterone raises basal body temperature.
- Why menstruation occurs if pregnancy does not happen.
- What hCG does if pregnancy occurs.
Things Worth Memorizing
- Phases of the ovarian cycle
- Phases of the uterine cycle
- Hormone responsible for ovulation (LH surge)
- Hormone dominant before ovulation (estrogen)
- Hormone dominant after ovulation (progesterone)
- Function of the corpus luteum
- Order of follicle development
Questions I Should Answer Without Looking
- What is oogenesis?
- What is the difference between an oocyte and an ovum?
- Which hormone triggers ovulation?
- Which hormone dominates the follicular phase?
- Which hormone dominates the luteal phase?
- What is the function of the corpus luteum?
- Why does menstruation occur?
- What changes occur in cervical mucus near ovulation?
- What happens if fertilization occurs?
- What happens if fertilization does not occur?
Compendium Entry
This chapter would probably become four pages in your Midwifery Compendium.
Page 1 — Ovarian Cycle
- Follicle development diagram
- Hormones involved
- Timeline
Page 2 — Uterine Cycle
- Menstrual
- Proliferative
- Secretory
- Endometrial changes
Page 3 — Hormones of the Menstrual Cycle
| Hormone | Produced By | Primary Actions | Peaks During |
|---|---|---|---|
| FSH | Anterior pituitary | Stimulates follicle growth | Early follicular |
| LH | Anterior pituitary | Triggers ovulation | Mid-cycle |
| Estrogen | Developing follicles | Thickens endometrium | Late follicular |
| Progesterone | Corpus luteum | Maintains endometrium | Luteal |
| Inhibin | Ovary | Suppresses FSH | Luteal |
Page 4 — Fertility Signs
- Cervical mucus changes
- Cervical position changes
- Basal body temperature
- Timing of ovulation
- Fertile window
Quick Reference Cards
This chapter naturally produces several cards that you’ll use repeatedly:
- Phases of the Menstrual Cycle
- Ovarian Cycle
- Uterine Cycle
- Follicular vs. Luteal Phase
- LH Surge
- Cervical Mucus Patterns
- Basal Body Temperature
- Corpus Luteum
- Fertile Window
- Hormones of the Menstrual Cycle
One study technique I think would be especially valuable
For this chapter, create a “Cycle Story” rather than just memorizing diagrams. Imagine you’re narrating the events of a 28-day cycle:
“A new cycle begins with menstruation. Low estrogen and progesterone allow FSH to rise, stimulating several follicles to grow. As one follicle becomes dominant, it produces increasing estrogen, which thickens the endometrium. High estrogen triggers the LH surge, leading to ovulation. The ruptured follicle becomes the corpus luteum, which secretes progesterone to prepare the uterus for implantation. If fertilization does not occur, the corpus luteum regresses, progesterone and estrogen fall, the endometrium sheds, and a new cycle begins.”
If you can tell that story from memory, you’ve mastered the physiology rather than merely memorized isolated facts. As you progress through later chapters, you’ll simply add new details—fertilization, implantation, placental hormone production, pregnancy physiology, and labor—to that same narrative. That approach mirrors how the body actually works and makes the information much easier to retain long term.
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