Question:
Placenta of dog and cat is
Placenta of dog and cat is
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Zonary placentas of dogs and cats contain marginal hematomas (greenish borders called hemophagous organs) that store iron from degraded maternal red blood cells, which is transported to the fetus.
Updated On: Aug 5, 2026
- Diffuse placenta
- Discoidal placenta
- Cotyledonary placenta
- Zonary placenta
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
The placenta is a temporary organ that facilitates nutrient, gas, and waste exchange between the maternal and fetal circulations.
Placentas are classified morphologically based on the distribution of chorionic villi on the chorionic sac.
Step 2: Detailed Explanation:
Let us review the four main morphological classifications of mammalian placentas:
Diffuse Placenta (A): Chorionic villi are distributed uniformly over the entire surface of the chorionic sac (e.g., in pigs and horses).
Cotyledonary Placenta (C): Chorionic villi aggregate into distinct vascularized button-like structures called cotyledons, which associate with maternal caruncles to form placentomes (e.g., in ruminants like cattle, sheep, and goats).
Discoidal Placenta (B): Chorionic villi are regionalized into one or two flat, disc-shaped areas (e.g., in primates, rodents, and rabbits).
Zonary Placenta (D): Chorionic villi form a complete or incomplete band or zone around the middle of the fetus, resembling a belt.
This zonary placenta is characteristic of carnivores, specifically dogs and cats.
Step 3: Final Answer:
The placenta of the dog and cat is classified as a zonary placenta.
The placenta is a temporary organ that facilitates nutrient, gas, and waste exchange between the maternal and fetal circulations.
Placentas are classified morphologically based on the distribution of chorionic villi on the chorionic sac.
Step 2: Detailed Explanation:
Let us review the four main morphological classifications of mammalian placentas:
Diffuse Placenta (A): Chorionic villi are distributed uniformly over the entire surface of the chorionic sac (e.g., in pigs and horses).
Cotyledonary Placenta (C): Chorionic villi aggregate into distinct vascularized button-like structures called cotyledons, which associate with maternal caruncles to form placentomes (e.g., in ruminants like cattle, sheep, and goats).
Discoidal Placenta (B): Chorionic villi are regionalized into one or two flat, disc-shaped areas (e.g., in primates, rodents, and rabbits).
Zonary Placenta (D): Chorionic villi form a complete or incomplete band or zone around the middle of the fetus, resembling a belt.
This zonary placenta is characteristic of carnivores, specifically dogs and cats.
Step 3: Final Answer:
The placenta of the dog and cat is classified as a zonary placenta.
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