Морфогенез сліпокишкових дивертикулів качок віком 25–120 діб
Abstract
MORPHOGENESIS of apical diverticula in ducks at the AGE OF 25–120 DAYS
T. A. Mazurkevych
Abstract. The lymphoid formation of digestive tract that are associated with its mucosa and represented by aggregated (Peyer patches, tonsils) and isolated lymphoid nodules and apical diverticula are important in the formation of birds’ immunity. The lymphoid tissue of the cecum and its diverticula in ducks insufficiently studied. The caecal (apical) diverticulum is a cone-shaped end of the cecum, in the wall of which there is a significant amount of lymphoid tissue. The aim of the research was to study the morphogenesis of caecal diverticula in ducks at the age of 25–120 days. To achieve this goal, linear parameters (length and maximum thickness) of the diverticula of the right and left ceca were determined, the microscopic structure of the diverticulum wall and the content of lymphoid tissue in it were investigated, and determined the forms that represented lymphoid tissue in the diverticulum wall tunics. Accepted methods of morphological studies were used to perform the work. The linear parameters (length and maximum thickness) of the diverticula of the right and left ceca change in ducks between the ages of 25 and 120 days. The lymphoid tissue, which determines the functional features of the caecal diverticula, is defined in its’ tunica mucosa and tunica muscularis in all age groups of ducks. The content of lymphoid tissue increases with age of the bird: in the tunica mucosa – from 45.23±3.12% in 25-day-old ducks to 65.69±1.99% in 120-day-old, in tunica muscularis – from 22.00±1.51% in 25-day-old bird to 43.49±0.49% in 120-day-old. In ducks of all studied age groups in the tunica mucosa of the diverticula of the right and left ceca, lymphoid tissue is represented by two structural forms: diffuse and secondary lymphoid nodules, and in the tunica muscularis – by only secondary lymphoid nodules.
Keywords: ducks, immunity, intestines, cecum, caecal (apical) diverticula, tunica mucosa, tunica muscularis, tunica serosa, lymphoid tissue, diffuse lymphoid tissue, secondary lymphoid nodules
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