Setoguti T, Inoue Y, Suematsu T
J Anat. 1982 Sep;135(Pt 2):395-406.
The fine structure of the intercellular junctions of the hen parathyroid gland was studied using freeze-fracture replicas and thin sections. In the conventional thin sections, desmosomes, intermediate junctions (maculae adherentes) and gap junctions were observed, and in the lanthanum-fixed sections, tight junctions (maculae occludentes) were demonstrated as well. In the freeze-fracture replicas, desmosomes, gap junctions, tight junctions and combination forms of gap and tight junctions occurred, but intermediate junctions were not identified. Junctional complexes (zonulae occludentes) were not encountered in any preparations. The gap junctions varied in size and shape; they ranged from irregularly shaped, minute assemblages of particles to large aggregations of a round or elliptic outline. Both the tight junctions and the combination forms of gap and tight junctions also exhibited a variety of shape and dimension, and, depending on the form of the tight junctional strands, they were classified into three types: type I consisted of a simple line of strands; type II consisted of a closed network of strands; and type III consisted of an open network of strands. The combination forms were more numerous than the typical tight junctions. The possible significance of these junctions is discussed in relation to the function of the parathyroid parenchymal cell.
利用冷冻蚀刻复型和超薄切片技术研究了母鸡甲状旁腺细胞间连接的精细结构。在传统的超薄切片中，观察到了桥粒、中间连接（黏着斑）和缝隙连接，在镧固定切片中也证实了紧密连接（闭锁斑）的存在。在冷冻蚀刻复型中，发现了桥粒、缝隙连接、紧密连接以及缝隙连接与紧密连接的组合形式，但未识别出中间连接。在任何标本中均未见到连接复合体（闭锁带）。缝隙连接的大小和形状各异；从不规则形状的微小颗粒聚集体到圆形或椭圆形轮廓的大聚集体都有。紧密连接以及缝隙连接与紧密连接的组合形式也呈现出多种形状和尺寸，并且根据紧密连接索条的形式，它们被分为三种类型：I型由单一索条线组成；II型由封闭的索条网络组成；III型由开放的索条网络组成。组合形式比典型的紧密连接更为常见。结合甲状旁腺实质细胞的功能对这些连接的可能意义进行了讨论。
