This figure shows a section of the seromucous sublingual gland, which consists mostly of mucous glands. The mucous tubules U are branched. There are serous caps at the end of each tubule [2 (Ebner's or Giannuzzi's demilunes) (cf. Figs. 132,382-384,386). The lightly stained cells in the tubules of the mucous glands show a honeycomb structure. Their spindle-shaped nuclei are located in the basal regions of the cells. In contrast, the cytoplasm of the serous demilune cells is stained red. The nuclei in these cells are round.
Stain: hematoxylin-eosin; magnification: x 400 Kuehnel, Color Atlas of Cytology, Histology, and Microscopic Anatomy © 2003 Thieme All rights reserved. Usage subject to terms and conditions of license.
Ectoderm and mesoderm partake in odontogenesis. The development of teeth starts in the 5th week of pregnancy. The fetal crown-rump length at this stage is about 7-10 mm. At this time, the multilayered nonkeratinizing squamous epithelium H proliferates and forms a narrow layer, which corresponds to the line of the adultjaw. Concomitantly, the epithelium fuses with the underlying jaw mesenchyme. This figure shows an early stage of the tooth germ in the form of the dental lamina [2 and the permanent teeth ridge [3, which are both oriented toward the inside. Fetus (crown-rump length = 2.8 cm).
1 Proliferated oral epithelium 4 Enamel organ
2 Dental lamina 5 Jaw mesenchyme
3 Permanent teeth ridge 6 Oral cavity
Stain: hematoxylin-eosin; magnification: x 80
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