Mnemonics: The placenta and fetal membranes
Functions of the Placenta
What needs to be memorized: Nutrition, Respiration, Excretion, Endocrine, Barrier/Protection, Storage
Mnemonic: "Never Run Exams Empty, Bring Snacks"
🔗 The Breakdown:
- Never → Nutrition (provides nutrients to fetus)
- Run → Respiration (gas exchange - O₂ and CO₂)
- Exams → Excretion (removes fetal waste products)
- Empty → Endocrine (produces hormones)
- Bring → Barrier/Protection (immunological barrier)
- Snacks → Storage (stores nutrients like glycogen)
Placental Hormones (Major Four)
What needs to be memorized: hCG (human Chorionic Gonadotropin), hPL (human Placental Lactogen), Estrogen, Progesterone
Mnemonic: "Cricket Players Eat Paneer"
🔗 The Breakdown:
- Cricket → hCG (human Chorionic Gonadotropin)
- Players → hPL (human Placental Lactogen)
- Eat → Estrogen
- Paneer → Progesterone
Components of Umbilical Cord
What needs to be memorized: 2 Umbilical Arteries, 1 Umbilical Vein, Wharton's Jelly
Mnemonic: "Two Artists, One Viewer, Whole jelly between them"
🔗 The Breakdown:
- Two Artists → Two Arteries (carry deoxygenated blood from fetus to placenta)
- One Viewer → One Vein (carries oxygenated blood from placenta to fetus)
- Whole jelly → Wharton's jelly (protective gelatinous substance)
💡 Extra Tip: Remember it's ULTA (opposite) in umbilical cord - Arteries carry Away deoxygenated blood, Vein brings Vital oxygenated blood!
Human Placenta - Four Key Characteristics
What needs to be memorized: Hemochorial, Deciduate, Discoid, Villous
Mnemonic: "Hema Decides Disco Vibes"
🔗 The Breakdown:
- Hema → Hemochorial (maternal blood directly contacts fetal trophoblast)
- Decides → Deciduate (decidua is shed at delivery)
- Disco → Discoid (disc-shaped)
- Vibes → Villous (has chorionic villi)
Fetal Membranes - Which is Inside, Which is Outside?
What needs to be memorized: Amnion (innermost - touching baby), Chorion (outer fetal membrane)
Mnemonic: "Amnion Andar, Chorion Cover"
🔗 The Breakdown:
- Amnion Andar → Amnion is inside, directly touching the baby and containing amniotic fluid
- Chorion Cover → Chorion is the outer covering (outermost fetal membrane)
💡 Think: Amnion has the Amniotic fluid that baby swims in, so it must be touching the baby!
Abnormal Placentation - Accreta/Increta/Percreta (Increasing Depth)
What needs to be memorized: Placenta Accreta (attached to myometrium), Placenta Increta (invades into myometrium), Placenta Percreta (penetrates through myometrium)
Mnemonic: "A-I-P: Attached → Invades → Penetrates"
🔗 The Breakdown:
- Accreta → Attached (abnormally adheres to myometrium surface - least severe)
- Increta → Invades INto the myometrium (medium severity)
- Percreta → Penetrates/Perforates completely through (can reach bladder - most severe)
💡 Remember: A-I-P means going deeper and deeper - like digging from surface to complete penetration!
Placental Barrier Layers (Fetal Blood to Maternal Blood)
What needs to be memorized: Fetal capillary Endothelium, Connective tissue, Cytotrophoblast, Syncytiotrophoblast (in order from fetal to maternal side)
Mnemonic: "Every Connection Creates Safety"
🔗 The Breakdown:
- Every → Endothelium (fetal capillary endothelium)
- Connection → Connective tissue (of the villus)
- Creates → Cytotrophoblast (Hofbauer cells; disappears after 20 weeks)
- Safety → Syncytiotrophoblast (in contact with maternal blood)
💡 Note: After 20 weeks, cytotrophoblast disappears, leaving only 3 layers!
Umbilical Blood Vessels - What Carries What
What needs to be memorized: Umbilical Arteries carry deoxygenated blood (fetus to placenta), Umbilical Vein carries oxygenated blood (placenta to fetus)
Mnemonic: "Umbilical cord mein sab ULTA! - Arteries Away, Vein is Vital"
🔗 The Breakdown:
- Arteries Away → Arteries carry deoxygenated blood Away from fetus (opposite of normal arteries!)
- Vein is Vital → Vein carries Vital oxygenated blood to the fetus (opposite of normal veins!)
💡 Key Concept: In umbilical circulation, everything is ULTA (reversed) compared to normal body circulation. This is super high-yield for NEET PG!
Placental Development Timeline - Key Weeks
What needs to be memorized: Week 2 (Primary villi form), Week 3 (Tertiary villi with blood vessels), Week 12 (Placenta fully formed and functional)
Mnemonic: "Do-Teen-Barah: Primary, Tertiary complete, Placenta Barah"
🔗 The Breakdown:
- Do (2) → Week 2: Primary villi appear
- Teen (3) → Week 3: Tertiary villi form (with blood vessels - complete structure)
- Barah (12) → Week 12: Placenta fully formed and functional
💡 Remember: 2-3-12 pattern - Primary becomes complete (tertiary) quickly, but full function takes till 12 weeks!
