🥚 Egg Anatomy: What’s Inside & What Each Part Does
Sorry for the quietness, my daughter and I got sick last week. We are much better now, thank God😊 Now let’s get cracking and learn about eggs! SHELL (Outer Protection) 🥚Made of calcium carbonate (~94%) 🥚Contains 7,000-17,000 tiny pores for gas exchange 🥚Allows oxygen in, carbon dioxide and moisture out 🥚Bloom/cuticle: invisible protective coating that seals pores SHELL MEMBRANES (Two Layers) 🪺Outer membrane: attached to shell 🪺Inner membrane: surrounds egg contents 🪺Together create barrier against bacteria 🪺Separate at blunt end to form air cell AIR CELL 💨Forms as egg cools after laying 💨Located at blunt/large end 💨Grows larger as egg ages (moisture loss through pores) 💨Freshness indicator: small air cell = fresh egg! 💨Provides oxygen for hatching chick ALBUMEN (Egg White) Four distinct layers: 🥚Outer thin albumen: watery, closest to shell 🥚Outer thick albumen: gel-like consistency 🥚Inner thin albumen: surrounds yolk 🥚Inner thick albumen: cushions yolk Functions: 🐓Protein source (primarily ovalbumin) 🐓Shock absorption/cushioning 🐓Antimicrobial protection 🐓Water reservoir for developing embryo CHALAZAE (Twisted Cords) 🪢White, rope-like strands on either side of yolk 🪢Anchor yolk in center of egg 🪢Keep yolk suspended and protected 🪢More prominent = fresher egg! 🪢Completely safe to eat YOLK (Nutrient Center) 🟡Contains most nutrients: fat, vitamins, minerals 🟡Color varies by hen’s diet (darker = more carotenoids) 🟡Surrounded by vitelline membrane (holds yolk shape) 🟡Germinal disc: small white spot where embryo develops if fertilized VITELLINE MEMBRANE 🪺Clear membrane surrounding yolk 🪺Weakens with age (old egg yolks break easily) 🪺Keeps yolk contents contained Egg Formation Timeline: Total time: 24-26 hours per egg! 🐓Yolk formation: ovary 🐓Albumen added: magnum (3 hours) Membranes added: isthmus (1 hour) 🐓Shell formed: shell gland (20+ hours!) 🐓Bloom applied: just before laying Your turn: ❓Ever noticed the chalazae and wondered what they were?