Question:
Which of the following animals has Type - II Peyer's Patches which are located at random intervals in ileum and jejunum?
Which of the following animals has Type - II Peyer's Patches which are located at random intervals in ileum and jejunum?
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Peyer's Patches Types:
Type I = Continuous ileal patch (Primary B-cell organ in ruminants/pigs; involutes).
Type II = Discrete jejunal/ileal patches (Secondary mucosal immunity in pigs/horses; persists).
Type I = Continuous ileal patch (Primary B-cell organ in ruminants/pigs; involutes).
Type II = Discrete jejunal/ileal patches (Secondary mucosal immunity in pigs/horses; persists).
Updated On: Sep 7, 2026
- Cattle
- Pigs
- Horses
- Rabbits
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Comparative mucosal immunology classifies mammalian gut Peyer's patches into Type I (primary lymphoid continuous ileal patch) and Type II (discrete secondary mucosal lymphoid nodules).
Step 2: Detailed Explanation:
In comparative veterinary anatomy and mucosal immunology:
1. Type I Peyer's Patches: Present in ruminants (cattle, sheep), dogs, and pigs as a continuous, dense lymphoid band in the terminal ileum that functions as a primary lymphoid organ for B-cell diversification and undergoes complete involution after puberty.
2. Type II Peyer's Patches: Discrete, follicle-containing lymphoid aggregates distributed at random, irregular intervals along both the jejunum and ileum that function throughout adult life as secondary mucosal immune induction sites, characteristic of Pigs, Equines, and Rodents.
Step 3: Final Answer:
Thus, Type-II Peyer's patches at random intervals are characteristic of Pigs, corresponding to option (B).
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