シロネズミ下垂体隆起部の電子顕微鏡的研究

概要

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The pars tuberalis of normal last was studied with the electron microscope. The pars tuberalis consists of several layers of relatively small epithelial cells lying close to the median eminence. The epithelial cells may be classified into two cell types. One is nongranulated cells containing a relatively large nucleus and a few mitochondria, rough and smooth endoplasmic reticula and Golgi apparatus. They compose the major part of the pars tuberalis. In some places, desmosomes and junctional complexes are observed between two adjacent cells. Sometimes colloid-like substance fills the intercellular space, into which a great number of microvilli and cilia may project. These morphological features may suggest a similarity of the non-granulated cells to chromophobes in the pars distalis of the anterior pituitary. The other cell type is granulated cells which are large in size and contain a number of mitochondria, well-developed rough and smooth endoplasmic reticula and Golgi apparatus. The most prominent characteristic of this cell type is the occurrence of many dark granules of about 150mμ in diameter. Each granule is enveloped by a single smooth membrane and frequently occur in close proximity to the Golgi apparatus. These cells resemble basophils in the pars distalis. The presence of these granulated cells may suggest morphologically the possibility that the pars tuberalis has a secretory function.
社団法人日本動物学会の論文
1965-10-15