Mean Number Of Mast Cells Research Articles

Developmental alterations in mast cell numbers and distributions within the thalamus of the albino rat.

A total of 216 male and female albino Wistar rats (Rattus norvegicus) between 10 and 60 days old from 42 litters were studied to determine mast cell characteristics within the thalamus. Whereas the mean numbers of mast cells within both the parenchyma and leptomeninges (combined) did not change appreciably after 15 days of age, the appearance of mast cells within the parenchyma (and disappearance from the leptomeninges) is clearly age-dependent. Between 15 and 25 days of age, the relative numbers of mast cells within the thalamic parenchyma changed from 20 to 90% of the total mast cells within thalamic space.

MAST CELL DISTRIBUTION IN THE UTERUS OF CYCLING AND PREGNANT HAMSTERS.

AbstractIn this study the distribution of mast cells in the cephalic, middle, or caudal portions of the uterine horns did not differ. In cross‐sections, however, mast cells were most numerous in the myometrium, intermediate in the tunica vasculare of the endometrium and least in the mucosa. In the endometrium, the mast cells were most numerous in the antimesometrial, least in the mesometrial and intermediate in the lateral quadrants. In the myometrium, however, the relative numbers of mast cells between the quadrants varied according to the day in the estrous cycle.On days 1 (the day after estrus), 2, 3, and 4, (the day of proestrus) of the estrous cycle, there were respectively 42.7, 21.8, 22.5 and 10.7 mast cells in the endometrium per 12 μ sections. The differences in means between groups was highly significant (P < 0.001). In mated females on 67, 79, 91, 103, 115, and 151 hours after ovulation, there were respectively 9.4, 8.4, 4.7, 5.6, 2.1, and 2.2 mast cells in the endometrium per 12 μ cross‐section. The differences in the means were not significant.The mean number of mast cells per 12 μ cross‐sections of uteri of ovariectomized females was 20 ± 8. Subcutaneous injections of 0.3 gamma estrogen did not significantly alter the number of mast cells but 0.6 gamma depressed the mean count to 11 ± 7.It appeared from these studies that the uterine mast cell numbers were related to the cyclic phenomena of estrous, but that the numerical relationship to the time of nidation was not clear.