Question:
The early embryo in the uterus is nourished by
The early embryo in the uterus is nourished by
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Embryonic Nutrition:
Pre-implantation embryo $\rightarrow$ HISTOTROPHIC Nutrition (Uterine milk Histotroph).
Post-implantation embryo $\rightarrow$ HEMOTROPHIC Nutrition (Placental blood exchange).
Pre-implantation embryo $\rightarrow$ HISTOTROPHIC Nutrition (Uterine milk Histotroph).
Post-implantation embryo $\rightarrow$ HEMOTROPHIC Nutrition (Placental blood exchange).
Updated On: Sep 7, 2026
- Yolk sac
- Blastocoel
- Histotrophic nutrition
- Endometrium
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Pre-implantation embryonic development relies on uterine gland secretions (uterine milk embryotroph histotroph) prior to placental vascular attachment.
Step 2: Detailed Explanation:
Embryonic nutrition modalities before and after implantation:
1. Histotrophic Nutrition (Embryotrophic Phase): During the extended pre-attachment/pre-implantation period in domestic ungulates (spanning days 12 to 20--30 in cattle, sheep, and horses), the free-floating blastocyst is nourished entirely by absorbing 'Histotroph' (Uterine Milk), a nutrient-rich secretome of proteins, lipids, glycogen, and growth factors secreted by the endometrial uterine glands.
2. Hemotrophic Nutrition: Establishes after definitive chorioallantoic placentation, delivering nutrients directly from maternal blood vessels.
Step 3: Final Answer:
Therefore, the early embryo is nourished by Histotrophic nutrition, corresponding to option (C).
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