Key Points Summary — Female Reproductive System and Oogenesis — Summary

Ovaries are the primary female gonads; produce oocytes and hormones (estrogen, progesterone).
Fallopian tube regions (ovary to uterus): Fimbriae → Infundibulum → Ampulla (fertilization site) → Isthmus → Uterus.
Uterine layers (outside to inside): Perimetrium → Myometrium (contractions) → Endometrium (cyclic changes; implantation site).
Oogenesis begins in fetal life: oogonia (2n) → enter meiosis I → primary oocytes (2n) arrested at prophase I.
At birth: ~2 million primary oocytes; by puberty: ~60,000–80,000 (due to atresia).
Each cycle: primary oocyte resumes meiosis I → secondary oocyte (n) + polar body I; secondary oocyte arrested at metaphase II.
Secondary oocyte is ovulated (released at ovulation) while arrested at metaphase II.
Meiosis II completes ONLY upon sperm penetration → mature ovum (n) + polar body II.
Total products per primary oocyte: 1 functional ovum + 2–3 polar bodies.
Supporting cells: Follicular (granulosa) cells surround the oocyte (analogous to Sertoli cells in males); secrete estrogen in response to FSH.
Key mnemonic: "P-P, S-M" — Primary oocyte at Prophase I; Secondary oocyte at Metaphase II.