Orofacial structures. Salivary glands. three pairs of major salivary glands + multiple minor glands minor glands located in the labial, lingual, palatal, buccal, glossopalatine and retromolar glands these are typically located in the submucosal layer. Salivary glands. compound tubuloacinar
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Lumen and intercellular canaliculi in a serous end piece. The lumen (L) and intercellular canaliculi were filled with India ink. Arrowheads indicate intercellular canaliculi extending between adjacent cells. N, Nuclei of serous cells.
Developing salivary gland. Lumen formation (arrows) has begun in the ducts. Branching of the distal ends of the epithelial cords is evident (arrowheads).
Light micrograph of human sublingual gland, stained with hematoxylin and eosin. Mucous tubules are abundant; many have serous demilunes (arrows).
The palatine tonsil possesses numerous primary crypts (A) surrounded by lymphoid nodules (B). Surface epithelium (C). The palatine tonsils differ from the lingual tonsils in that secondary crypts (D) may arise as branches from the primary invaginations. In addition, no mucous glands secrete into the crypts which tend to fill with debris and defense cells (lymphocytes, macrophages, and PML's).
Lymphoid nodules (A) aggregating around a pit or primary crypt (B) that opens onto the free surface of the mucosa. Typically the surface would be lined by non-keratinizing stratified squamous epithelium that continues down into the crypts. Mucous glands (C) secrete into the bottom of the crypts. The posterior aspect of the tonsil is surrounded by a connective tissue capsule (D).