Question:
The placenta of bitch is classified as
A. Zonary
B. Deciduate
C. Villous
D. Endotheliochorial
E. Discoidal
Choose the correct answer from the options given below:
The placenta of bitch is classified as
A. Zonary
B. Deciduate
C. Villous
D. Endotheliochorial
E. Discoidal
Choose the correct answer from the options given below:
A. Zonary
B. Deciduate
C. Villous
D. Endotheliochorial
E. Discoidal
Choose the correct answer from the options given below:
Show Hint
Remember that carnivores (dogs and cats) share the exact same placental classifications: Zonary (shape), Endotheliochorial (histology), and Deciduate (shedding).
Updated On: Aug 24, 2026
- A, B and D only
- A, C and D only
- B, D and E only
- B, C and E only
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Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Placentation in mammals is classified based on several criteria, including the gross shape (distribution of chorionic villi), the histological layers separating maternal and fetal blood, and the amount of maternal tissue lost during parturition.
Step 2: Detailed Explanation:
Let us evaluate each classification statement regarding the canine (bitch) placenta:
- A. Zonary: Correct. In dogs and cats, the chorionic villi form a prominent band or "zone" around the middle of the chorionic sac.
- B. Deciduate: Correct. During parturition, there is a significant loss of maternal uterine tissue (decidua) along with the fetal membranes, which is accompanied by maternal hemorrhage.
- C. Villous: Incorrect. The microscopic interdigitation of the canine placenta is lamellar (labyrinthine) rather than purely villous.
- D. Endotheliochorial: Correct. Histologically, the maternal uterine epithelium and connective tissue are lost, leaving the chorionic epithelium of the fetus in direct contact with the endothelial lining of the maternal blood vessels.
- E. Discoidal: Incorrect. Discoidal placentation is characteristic of primates, rodents, and bats, where villi are restricted to a disc-shaped area.
Therefore, the correct features describing the placenta of a bitch are A, B, and D only.
Step 3: Final Answer
The correct option is (A).
Placentation in mammals is classified based on several criteria, including the gross shape (distribution of chorionic villi), the histological layers separating maternal and fetal blood, and the amount of maternal tissue lost during parturition.
Step 2: Detailed Explanation:
Let us evaluate each classification statement regarding the canine (bitch) placenta:
- A. Zonary: Correct. In dogs and cats, the chorionic villi form a prominent band or "zone" around the middle of the chorionic sac.
- B. Deciduate: Correct. During parturition, there is a significant loss of maternal uterine tissue (decidua) along with the fetal membranes, which is accompanied by maternal hemorrhage.
- C. Villous: Incorrect. The microscopic interdigitation of the canine placenta is lamellar (labyrinthine) rather than purely villous.
- D. Endotheliochorial: Correct. Histologically, the maternal uterine epithelium and connective tissue are lost, leaving the chorionic epithelium of the fetus in direct contact with the endothelial lining of the maternal blood vessels.
- E. Discoidal: Incorrect. Discoidal placentation is characteristic of primates, rodents, and bats, where villi are restricted to a disc-shaped area.
Therefore, the correct features describing the placenta of a bitch are A, B, and D only.
Step 3: Final Answer
The correct option is (A).
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