ラット三大唾液腺(耳下腺・顎下腺・大舌下腺)主導管の走査および透過電顕による形態学的研究

概要

論文の詳細を見る
The fine structure of the main excretory duct (MED) of the rat major salivary glands (parotid gland, submandibular gland, sublingual gland) was observed by scanning and transmission electron microscopy. The MED epithelium of the parotid gland was mainly composed of cuboidal cells stratified in two or three layers. Well-developed interdigitations were observed between those cells. Basal cells were situated close to the basal lamina. Light cells (Type I) with basal infoldings, dark cells with basal infoldings, and tuft cells which had long finger-like microvilli and no basal infoldings were scattered thinly among the stratified cuboidal epithelium. As the cuboidal cells were the most numerous, the MED epithelium of the parotid gland seems to be involved to a lesser degree in rendering the hypotonic saliva. The MED epithelium of the submandibular gland was mainly composed of light cells with basal infoldings. There were two types of light cells. They were columnar light cells (Type II) and columnar light cells with expanded apexes (Type III). Dark cells, which were columnar cells with basal infoldings, and tuft cells, which were also columner cells with prominent microvilli and without basal infoldings, were scattered thinly among light lights (Type II and Type III). Basal cells were situated to the basal one third of the columnar cells. The MED epithelium of the rat submandibular gland had the morphological feature of active water and ion transport. The MED epithelium of the sublingual gland was similar to that of the submandibular gland. The basal infoldings of light cells (Type II and Type III) were poorly developed compared to those of the submandibular gland. However interdigitations between light cells and neighboring cells were well-developed. The MED epithelium of the sublingual gland seems to be involved in rendering the hypotonic saliva. Dark cells, tuft cells and basal cells were commonly seen in the MED epithelium of the rat major salivary glands. Only microvilli were seen on the free surface of the MED epithelium of the parotid gland which makes a serous secretion. Microvilli and microridges were seen on the free surface of the MED epithelium of the submandibular gland. This gland manufactures a mucous-serous secretion. Microvilli and microridges were also found on the free surface of the MED epithelium of the sublingual gland which generates a mucous secretion. It was revealed that the MED of all rat major salivary glands assisted in not only transporting saliva into the oral cavity, but also modifying primary saliva to make a final secretion. The existence of tuft cells in all the epithelia of the MED suggested that the MED might have a more important function than was commonly supposed.
九州歯科学会の論文
1982-08-25

ラット三大唾液腺(耳下腺・顎下腺・大舌下腺)主導管の走査および透過電顕による形態学的研究

スポンサーリンク

概要

著者

関連論文

スポンサーリンク