![]() The cilia show a 9+2 microtubular structure with basal bodies provided with striated rootlets. These cells interpolate with goblet cells, rare mitochondria-rich cells, ciliated cells and numerous small globous cells showing a clear matrix and lacking secretory granules. The inner side consists of a single layer of cuboidal-columnar cells with dense apical granules and well-developed organelles synthesizing and condensing secretions. ![]() The outer side is composed of 2–3 layers of malpighian cells lying on the basal lamina. The main excretory duct, which opens at the bottom of the vallum, shows a stratified epithelium. The outer layer is composed of basal cells lying on the basal lamina. The inner layer consists of columnar cells showing bundles of tonofilaments with scarce secretory activity. Excretory ducts, coming together in the main duct, are lined by a bistratified epithelium. They are characterized by dense, clear-core secretory granules (mostly in the apical cytoplasm) a basal nucleus well-developed RER and Golgi apparatus and thin filaments distributed in supra- and perinuclear cytoplasm. The columnar cells of the intercalated ducts are arranged in a monolayer. The tubuloalveolar cells, pyramid-shaped, show large and dense secretory granules (clear cored) throughout the cytoplasm, rare basal folds and packed cisternae of rough endoplasmic reticulum (RER) at the basal pole. They are formed by tubuloalveolar adenomeres, intercalated ducts and excretory ducts coming together in the main excretory duct. Human deep posterior lingual glands (von Ebner’s glands) are located beneath the circumvallate papillae.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |