Medical School MD + DO Mastery

A 4-year, board-aligned study system for medical school and licensing exams.

Walk the full Year 1–4 curriculum — foundational sciences, organ-system blocks, clinical clerkships and advanced practice — each with mastery checklists and linked learning resources, plus a dedicated review system for school exams, Shelf/COMAT, USMLE Step 1–3 and COMLEX-USA Levels 1–3.

YEAR 2 SYSTEMS REVIEW - REPRODUCTIVE + PREGNANCY

YEAR 2 | PAGE 48C - HPG AXIS / CYCLE -> FERTILITY -> PREGNANCY TIMELINE -> PATHOLOGY / PHARM

REPRODUCTIVE SPINE: HPG AXIS -> GAMETOGENESIS -> CYCLE / OVULATION -> FERTILIZATION -> IMPLANTATION / PLACENTA -> PREGNANCY ADAPTATION. MAKE AGE, PREGNANCY STATUS AND GESTATIONAL TIMING EXPLICIT BEFORE YOU INTERPRET BLEEDING, PAIN OR HORMONE PATTERNS. G. REPRODUCTIVE / PREGNANCY CLOSED-BOOK REVIEW MAP

LANE	MUST RETRIEVE WITHOUT NOTES	HIGH-DISCRIMINATION TRANSFER
HPG axis + gametogenesis	GnRH pulse logic; FSH/LH; Sertoli/Leydig; spermatogenesis/oogenesis; puberty and sexual differentiation.	Use hormone source + target cell + feedback relationship to predict infertility and gonadal failure patterns.
Cycle + infertility	Follicular/luteal and endometrial phases; ovulation; PCOS/endometriosis; ovarian reserve; male/female infertility localization.	Anchor every hormone to the phase and cell producing it; then interpret amenorrhea/anovulation.
Fertilization + placenta	Fertilization, implantation, trophoblast, hCG, placental hormones and pregnancy adaptation.	Use gestational sequence to distinguish normal physiology from abnormal implantation/trophoblastic disease.
Pregnancy complications	Ectopic, miscarriage, preeclampsia/HELLP, gestational diabetes, previa/abruption/accreta, Rh concepts.	Start with stability + gestational age + bleeding/pain pattern before choosing a diagnostic or management sequence.
Reproductive pathology + therapy	Breast, ovarian/endometrial/cervical, testicular/prostate patterns; contraception/fertility drugs; hormone-responsive disease.	Use age + anatomy + marker/receptor/hormone pattern to discriminate close mimics.

H. TOP 10 MOST-MISSED SYSTEM CONCEPTS - #8 TO #10

# / CONCEPT	DEEP EXPLANATION	WHY STUDENTS MISS IT	EASIEST CLUE
8. The menstrual cycle is a timeline, not a hormone list	Follicular growth raises estrogen; sustained high estrogen triggers the LH surge and ovulation; the corpus luteum produces progesterone during the luteal phase; withdrawal permits menses. The endometrium changes in parallel.	Students memorize hormone peaks separately from ovarian and endometrial events, then miss infertility/amenorrhea questions.	Always draw ovary on top, endometrium below, hormones between.
9. Pregnancy bleeding / pain requires gestational timing +	The differential and next diagnostic step depend on whether the patient is hemodynamically stable, whether pregnancy is	A familiar label such as ectopic, miscarriage, previa or abruption can pull attention away from timing	Start with stable? pregnant? how far along? where is the
stability	confirmed, gestational age, pain/bleeding pattern, beta-hCG trajectory and ultrasound findings.	and sequence.	pregnancy?
10. Reproductive tumors are age + compartment +	Breast, ovarian, uterine, cervical, testicular and prostate tumors differ by age, tissue of origin, hormone/receptor biology, markers,	Learners memorize marker tables but do not connect them to the tissue or patient context.	Ask which organ compartment, which age, which
marker/receptor problems	spread patterns and screening/diagnostic context.		marker/receptor fits?

I. HIGH-VALUE REVIEW RESOURCES - DIRECT + PLAYABLE

RESOURCE	ROLE IN THIS REVIEW
Ninja Nerd - Spermatogenesis	Sertoli/Leydig physiology and gametogenesis.
Ninja Nerd - Ovulation	Follicular recruitment, estrogen feedback, LH surge and corpus luteum.
Ninja Nerd - Menstrual Cycle	Ovarian + endometrial phase integration.
Ninja Nerd - Fertilization	Capacitation, acrosome/cortical reactions and early embryo steps.
Ninja Nerd - Placental Development	Implantation, trophoblast, chorionic villi and placental endocrine function.
HyGuru - Top NBME Concepts: Reproductive	Long-form active-recall integration of reproductive physiology, pathology, pregnancy and embryology.

I. HIGH-VALUE REVIEW RESOURCES - DIRECT + PLAYABLE

SCHOOL-EXAM GATE	BOARD / COMLEX TRANSFER
• Rebuild HPG/cycle/pregnancy timelines without notes. • Interpret infertility/amenorrhea from hormone and anatomy patterns.	• Physiology -> timing/marker -> pathology -> pharmacology/diagnostic inference. • Review tumor markers only within age/anatomic context.
• Use pregnancy timing and stability before choosing a label or next step. 2026/27 systems-review expanded edition - align with school objectives and verify official exam updates before testing	• Use new mixed cases to prove the timeline transfers under pressure.