Groups of mucous glands (glandulae radices linguae) in considerable numbers exist in the area of the lingual root, radix lingua, under the lingual tonsil (see Figs. 338, 339). The clustered mucous glands are not restricted to the tunica mucosa but extend deeper between the muscle fiber bundles. The glandular ducts end in the canals of the lingual follicles. Connective tissue septa (trabeculae) (stained blue) and sectioned striated muscle fibers H are present between the glandular lobes. The nuclei (stained red) in the basal cell region and the cytoplasm with its honeycomb structure (cf. Fig. 130) are characteristic of mucous glands. The secretory ducts have wide lumina. The paired seromucous anterior lingual gland (Nuhn'sgland) is located close to the tip of the tongue.
1 Striated skeletal musculature of the tongue
Stain: azan; magnification: x 100
The parotid gland (glandula parotidea, or short parotis) is the largest human salivary gland. It is a purely serous gland with long, branched secretory ducts. The entire length of the secretory duct is always contained in the glandular lobe. Groups of fat cells [2 occur between the wide serous acini 0. The nuclei of serous acinar cells are round and located in the basal cell region. Their cytoplasm is finely granulated (see Fig. 129). A long intercalated duct 0 traverses the center of the image from top left to bottom right. There are also cross-sectioned intercalated ducts0.The ducts are lined by an isoprismatic (cuboid) epithelium (see Figs. 380, 381).
1 Serous acini
2 Fat cells
3 Intercalated duct, cut longitudinally
4 Intercalated duct, cross-sectioned
Stain: alum hematoxylin-eosin; magnification: x 200
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