Secondary lymphoid areas in calf ileal Peyer's patch.
The secondary lymphoid tissues appear in sheep ileum after involution of ileal Peyer's patch (PP). However, the existence of the secondary lymphoid tissues before involution of ileal PP has not yet been studied. We examined morphological characteristics of the full length of calf ileal PP using gross and microscopic anatomical techniques. Most areas of ileal PP consisted of densely packed lymphatic follicles contained very few follicular T-cell and associated with only scant interfollicular areas. However, the proximal end of ileal PP consisted of widely dispersed lymphatic follicles contained many follicular T-cell and associated with large interfollicular areas. The histological architectures of the proximal end of ileal PP strongly resembled those of the secondary lymphoid tissue in calf.
Department of Veterinary Anatomy, Faculty of Agriculture, University of Miyazaki, Miyazaki, Japan.
Motoko
M
Takanashi
Tetsuo
T
Nasu
Takayuki
T
Murakami
Masahiro
M
Yasuda
D000818:Animals; D017252:CD3 Complex / Q000276:immunology; D002417:Cattle; D007082:Ileum / Q000166:cytology*; D010581:Peyer's Patches / Q000166:cytology* / Q000276:immunology*; D013601:T-Lymphocytes / Q000166:cytology
D017252:CD3 Complex