摘要
Human normal endometrium was examined in ultrathin sections.Nucleolar channel system(NCS) appeared in the endometrial epithelial cells during the early and mid secretory phase of menstrual cycle.The NCS was a hollow ball like structure of different sizes and was composed of 2 to 5 rows of tubules embedded in an amporphous matrix.On its surface there were numerous electron dense particles resembling ribosomes,It was usually located within or associated with the nucleolus,SOmetimes,it was close to the nuclear envelope or protruding out from the nucleus .On occasion,NCS with simplified structure was found in the perinuclear cytoplasm.Concepts concerning the genesis,involution and function(s) of the NCS were disussed.
Human normal endometrium was examined in ultrathin sections. Nucleolar channel system (NCS) appeared in the endometrial epithelial cells during the early and mid secretory phase of menstrual cycle. The NCS was a hollow ball like structure of different sizes and was composed of 2 to 5 rows of tubules embedded in an amorphous matrix. On its surface there were numerous electron dense particles resembling ribosonies. It was usually located within or associated with the nucleolus. Sometimes, it was close to the nuclear envelope or protruding out from the nucleus. On occasion, NCS with simplified structure was found in the perinuclear cytoplasm. Concepts concerning the genesis, involution and function(s) of the NCS were discussed.
