Describe follicle development ovulation and the corpus luteum
Ovarian sequence: developing follicle → egg release → remaining follicle becomes corpus luteum. In a cycle without established pregnancy the corpus luteum later breaks down.
Section B14.2 · Sexual reproduction in humans
Cross-referenced to the 2028–2029 0653 section using original teaching from the related single-science courses. A 0653-specific objective-by-objective and Core/Supplement review is in progress. Written practice is self-checked and does not demonstrate supervised laboratory competence or award an official Cambridge grade.
Before you begin
- Recall endocrine glands, blood-borne hormones, ovaries, testes, uterine lining, ovulation and implantation.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What is ovulation?
What you will learn
- Order the main ovarian changes
- Distinguish an egg from its surrounding follicle
Original teaching model.
| Feature | Meaning |
|---|---|
| Follicle | Ovarian tissue around a developing egg |
| Ovulation | Egg release from ovary |
| Corpus luteum | Remaining follicular tissue in ovary |
| Timing | Illustrative, not universal |
Order the main ovarian changes
The menstrual cycle includes changes in an ovary as well as changes in the uterine lining. In the ovary, a follicle containing a developing egg matures. A follicle is the surrounding ovarian structure; it is not just another word for the egg cell. Describing the follicle and the egg separately helps explain what is released and what remains after ovulation.
Ovulation is the release of an egg from an ovary. The nearby open end of an oviduct receives the egg and it can be transported along the tube. Ovulation is not fertilisation, because nuclear fusion with a sperm has not been established by release alone. It is also not menstruation, which concerns shedding of uterine lining rather than release from an ovary.
Distinguish an egg from its surrounding follicle
After ovulation the remaining follicular tissue forms the corpus luteum. This structure remains in the ovary; it does not travel down the oviduct as the egg does. If pregnancy is not established, it later breaks down. These ovarian events can be ordered as follicle development, ovulation, corpus-luteum formation and later breakdown in a non-pregnant cycle.
The original event model shows an illustrative order rather than a photograph or a universal day schedule. A labelled day of ovulation belongs to the supplied teaching model. Real cycles vary in length and timing, so a sequence answer should not claim that every person releases an egg on day fourteen. The detailed hormonal mechanism is treated in the Extended pathway.
Sources for this lesson
Pause and explain
What forms from the remaining follicle after ovulation?
Worked example
What remains in the ovary after an egg is released?
Show the worked solution
- Separate released egg from remaining follicular tissue.
- Name the structure formed from that tissue.
Answer The egg leaves during ovulation; the remaining follicular tissue forms the corpus luteum in the ovary.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Order follicle development, corpus-luteum formation and ovulation.
Give me a hint
Ask which tissue is present before and after release.
Compare my reasoning
- Begin with a developing follicle.
- Place ovulation before corpus-luteum formation.
Follicle development → ovulation → corpus-luteum formation.
Look for these in your work
- Correct order
- Separate egg and follicle
Describe the different locations of released egg and corpus luteum.
Give me a hint
Follow the released cell separately from ovarian tissue.
Compare my reasoning
- Place released egg near/in the oviduct route.
- Keep corpus luteum in ovary.
The released egg enters the oviduct route; the corpus luteum forms from remaining follicular tissue in the ovary.
Look for these in your work
- Name both locations
- Explain their different origins
An illustration places ovulation on day 14. Can this prove fertilisation or a universal schedule?
Give me a hint
Use what the illustration actually stipulates.
Compare my reasoning
- Identify release as the shown event.
- Reject both nuclear-fusion and universal-time claims.
The diagram shows ovarian egg release on its stipulated day; it does not prove fertilisation and does not establish the same timing in every real cycle.
Look for these in your work
- State the shown event
- Give both limits
Common mistakes
- Ovulation is not fertilisation.
- The corpus luteum remains in the ovary.
What can you explain now?
What forms from the remaining follicle after ovulation?
Compare with the explanation
Corpus luteum
It remains in the ovary.
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Make it stick
Explain order the main ovarian changes and distinguish an egg from its surrounding follicle. Follow the event arrows or graph labels before opening the solutions.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.