Ultrastructure of the human pharyngeal hypophysis
作者:
Carlos B. González,
Gustavo F. Valdés,
Daniel R. Ciocca,
期刊:
Cells Tissues Organs
(Karger Available online 1977)
卷期:
Volume 97,
issue 2
页码: 224-230
ISSN:1422-6405
年代: 1977
DOI:10.1159/000144737
出版商: S. Karger AG
关键词: Human;Pharyngeal hypophysis;Ultrastructure;Endocrine gland;Cell types
数据来源: Karger
摘要:
Four types of secretory cells have been distinguished in the human pharyngeal hypophysis. Type I cells contain granules of about 70–90 nm in diameter; type II cells are the most numerous and are loaded with granules ranging in size between 100 and 200 nm. In type III cells the size of the granules ranges between 150 and 250 nm in diameter. Type IV cells contain the largest secretory granules (250–400 nm). In addition, there is a type of cell lacking secretory granules and which has been regarded as interstitial cell (type V). The different cell types are arranged in clusters which, in turn, are surrounded by numerous blood capillaries. A few nerve fibres have been observed within the gland. These fibres make synaptoid contacts with type II cells. The ultrastructural analysis of the human pharyngeal hypophysis strongly suggests that this formation is an endocrine gland with distinct characteristics and with a functional role probably different from that of the sellar hypophy
点击下载:
PDF
(973KB)
返 回