妊娠, 授乳期におけるラット顎下腺の逐日的変化に関する病理組織学的研究
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The author undertook a pathohistological investigation of the daily changes in the female submandibular glands of rats of Wistar strain during sexual dimorphism, pregnancy, lactation and cessation of lactation periods (from the 7th day to 8 weeks of pregnancy). The results obtained were as follows : 1. Male-female difference was observed morphologically in the granular tubules and striated ducts. Compared with the female, the male showed a better extension of the granular tubules, the diameters of granular tubules were larger and hypertrophy of granular tubule cells was observed. Compression and disapperance of the nuclei were frequent and secretory granules were more abundant, the diameters of the striated ducts were larger and epithelial cells were higher in height. Incidence of eccentric location of the nuclei to the basal side was high. Appearance of vacuoles and disappearance of the basal striations were relatively high. 2. Male-female difference was not observed in the terminal portions, intercalated ducts, or interlobular ducts. 3. Measurements of the average diameters of the submandibular granular tubules in the male and in the female revealed a significant difference : female (39.3±5.7μ) : male (46.7±6.6μ). 4. Findings of spontaneous masculinization were seen in the granular tubules and striated ducts of the submandibular glands during pregnancy and lactation periods. 5. Findings of spontaneous masculinization during pregnancy and lactation became significant on the 14th day, reached a peak on the 7th after delivery and declined gradually thereafter. On the 14th day after cessation of lactation (first 8 weeks of pregnancy), the findings were about the same as those of the non-pregnant female submandibular glands. 6. No findings of spontaneous masculinization were seen in the terminal portions, intercalated ducts and interlocular ducts. 7. Measurements of the average diameters of the submandibular granular tubules revealed on the 14th day after pregnancy a significant difference compared with those of the non-pregnant female, as was the case in morphological changes. Thereafter, the diameters gradually increased and reached a maximum on the 7th day after delivery. The diameters then gradually decreased and were about the same as those of the non-pregnant on the 14th day after cessation of lactation (first 8 weeks of pregnancy). No significant difference then was observed.
- 九州歯科学会の論文
- 1978-09-30
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