7.6: Applied Thinking Self - Assessment

Scenario 1

A patient presents with infertility, and imaging reveals that his epididymides are extremely underdeveloped while his testes and accessory glands appear normal.

Probing Prompts

• Explain how this specific anatomical defect could impair fertility even if spermatogenesis is normal.
• Predict what you would expect to see in a semen analysis (for example, sperm count, motility, morphology) and justify your reasoning.

Scenario 2

A 13-year-old girl presents with delayed puberty: she has not developed breast tissue, has no pubic hair, and has not begun menstruating. Laboratory tests show very low estrogen, but extremely high FSH and LH.

Probing Prompts

• Use your understanding of feedback regulation to explain why her gonadotropin levels are high.
• Based on these findings, hypothesize where the primary defect lies (hypothalamus, pituitary, or ovaries) and predict what her ovarian anatomy might look like.

Scenario 3

A couple has been attempting to conceive for over a year. The female partner has ultrasound evidence of multiple medium-sized ovarian follicles that fail to progress to ovulation (anovulation), and her LH levels remain chronically elevated with no clear mid-cycle surge.

Probing Prompts

• Explain how this hormonal pattern disrupts the normal sequence of ovarian events prior to ovulation.
• Discuss how this might affect the endometrium and the likelihood of successful implantation, even if occasional ovulation occurred.

Scenario 1

You are comparing reproductive anatomy and function in people with testes and people with ovaries to prepare patient education materials.

Probing Prompts

• Compare the functional roles of the male and female gonads and their primary accessory ducts (epididymis and uterine tube).
• How do these structures each support gamete survival, maturation, and transport?
• Discuss how their anatomical design reflects different reproductive strategies and timing in males versus females.

Scenario 2

You are following the path of a single sperm that may eventually fertilize an oocyte during natural conception.

Probing Prompts

• Trace the journey of a single sperm cell from its origin as a spermatogonium in the testis to its potential fusion with an oocyte in the female reproductive tract, naming each anatomical structure it passes through in both the male and female.
• At three key points along this journey, describe a specific cellular or biochemical change the sperm undergoes and explain why that change is essential for successful fertilization.

Scenario 3

You are reviewing the ovarian cycle of a patient with regular, ovulatory cycles to explain how hormonal contraception works.

Probing Prompts

• Consider the ovarian events during the follicular phase of the menstrual cycle. Describe the structural changes that occur in a follicle as it progresses from primordial to primary, secondary, and mature (Graafian) stages before ovulation.
• Correlate these structural changes with changing levels of FSH, LH, and estrogen, and explain how these hormones interact to produce a single dominant follicle in most cycles.

Scenario 1

A teenage male has normal hypothalamic GnRH secretion but a mutation that prevents his anterior pituitary from producing FSH, while LH secretion is intact.

Probing Prompts

• Predict the effects on his testicular function, including testosterone production, spermatogenesis, and testis size.
• Explain the endocrine feedback pattern you would expect to observe, including testosterone and inhibin levels and pituitary hormones.

Scenario 2

A woman has a pituitary tumor that selectively destroys the cells that produce LH, but FSH production is preserved.

Probing Prompts

• Describe how this would alter follicular development, ovulation, and corpus luteum formation.
• Predict the consequences for her estrogen and progesterone levels and her menstrual cycle pattern, and explain your reasoning.

Scenario 3

A reproductive endocrinologist is treating a patient with infertility by administering exogenous FSH early in the follicular phase and then a single large dose of LH mid-cycle.

Probing Prompts

• Explain the physiological rationale behind this treatment in terms of normal ovarian events prior to ovulation.
• Predict how this regimen might change the number of oocytes released compared with a natural cycle, and discuss potential risks.

Scenario 4

You are counseling families about what to expect during puberty in adolescents of different sexes.

Probing Prompts

• During puberty, both males and females experience a “reawakening” of the hypothalamic–pituitary–gonadal axis. Describe the changes that occur in hypothalamic GnRH secretion and pituitary responsiveness leading up to puberty.
• Compare how rising gonadal steroid hormone levels drive the development of primary and secondary sex characteristics in males versus females, linking specific hormones to specific anatomical and physiological changes.

Scenario 1

You are studying prenatal development of the internal reproductive ducts in an XY fetus with a known mutation affecting anti-Müllerian hormone (AMH).

Probing Prompts

• Early in prenatal development, the internal reproductive ducts are “bipotential.” Explain how the presence or absence of testes and their hormones (testosterone and anti-Müllerian hormone) directs the development of male versus female internal duct systems.
• Predict the internal reproductive anatomy of an XY fetus that produces testosterone normally but lacks functional anti-Müllerian hormone, and justify your prediction based on embryologic principles.

Scenario 2

During assisted reproductive techniques, sperm are sometimes placed closer to the ovary rather than traversing the entire female reproductive tract.

Probing Prompts

• Sperm reaching the ampulla of the uterine tube must undergo capacitation before they can successfully fertilize an oocyte. Describe what capacitation is and where it normally occurs.
• Explain why sperm released directly into the peritoneal cavity near the ovary might have different fertilization success than sperm that have traveled through the full female reproductive tract.