Female reproductive organs

Ovaries - Egg Baskets

• Primary Functions: Oogenesis (maturation of oocytes within follicles) and hormone production (estrogen and progesterone).
• Location & Structure: Almond-shaped organs in the ovarian fossa; not covered by peritoneum. Histologically divided into an outer cortex (containing follicles) and an inner medulla (blood vessels, nerves).
• Ligamentous Support:
  • Suspensory Ligament: Connects ovary to pelvic wall; contains the ovarian artery, vein, and nerve plexus.
  • Ovarian Ligament: Connects the ovary to the lateral surface of the uterus.

⭐ Venous Drainage Asymmetry: The left ovarian vein drains into the left renal vein, while the right ovarian vein drains directly into the Inferior Vena Cava (IVC).

Uterus & Tubes - The Main Events

• Uterus: Pear-shaped muscular organ. Normal position is anteverted and anteflexed.

  • Layers: Endometrium (sheds), Myometrium (smooth muscle), Perimetrium (serosa).
  • Support: Broad ligament (mesentery), Round ligament (maintains anteversion, travels through inguinal canal), Cardinal/Uterosacral ligaments.
  • 📌 Mnemonic: "Water under the bridge" - Ureter runs under the Uterine Artery.

• Fallopian Tubes: Transport oocyte from ovary to uterus.

  • Segments: Fimbriae → Infundibulum → Ampulla → Isthmus.

⭐ The ampulla is the longest and most tortuous part of the fallopian tube. It is the most common site of both fertilization and ectopic pregnancy.

Vagina & Vulva - Gateway to the World

• Vagina: Fibromuscular tube lined by non-keratinized stratified squamous epithelium. Normal flora (Lactobacilli) maintain an acidic pH, preventing infection. Embryologic origin is dual: upper 1/3 from paramesonephric ducts, lower 2/3 from urogenital sinus.

• Vulva: External genitalia. Includes mons pubis, labia majora & minora, clitoris (corpus cavernosum), and vestibule containing urethral & vaginal orifices.

  • Glands: Greater vestibular (Bartholin's) & lesser vestibular (Skene's) glands provide lubrication.

⭐ Bartholin's Gland Cyst: Commonest vulvar mass. Blockage of the duct leads to fluid accumulation. Presents as a unilateral, painless mass at the 4 and 8 o'clock positions of the vaginal orifice. May lead to a painful abscess.

Neurovasculature - The Supply Lines

• Arterial Supply: Dual origin from the aorta & internal iliac artery.

  • Ovarian Artery: From abdominal aorta; supplies ovary/tube.
  • Uterine & Vaginal Arteries: From internal iliac artery.
  • Internal Pudendal Artery: Supplies perineum & external genitalia.

• Venous Drainage: Veins mirror the arterial supply.

  • Left Ovarian Vein → Left Renal Vein
  • Right Ovarian Vein → Inferior Vena Cava (IVC)
  • Uterine Plexus → Internal Iliac Vein

• Innervation: Primarily from pelvic plexuses.

  • Autonomic: Inferior hypogastric plexus (uterovaginal plexus).
  • Somatic: Pudendal nerve (S2-S4) for perineum.

⭐ Surgical Pearl: The ureter passes inferior to the uterine artery ("water under the bridge"). It is at high risk of iatrogenic injury during a hysterectomy.

High‑Yield Points - ⚡ Biggest Takeaways

• The uterine artery crosses superior to the ureter ("water under the bridge"), a critical surgical relationship.
• Primary uterine support is from the cardinal (transverse cervical) ligament, which contains the uterine vessels.
• The round ligament maintains uterine anteversion and is a remnant of the gubernaculum.
• Ovaries drain lymph to para-aortic nodes; the uterus & cervix drain to obturator and iliac nodes.
• The pudendal nerve (S2-S4) provides perineal sensation and is blocked near the ischial spine.
• Ovarian arteries arise from the abdominal aorta below the renal arteries.