The nucleolar channel system of human endometrium.
Human endometrium taken during the early to mid-secretory portion of the menstrual cycle is studied with the electron microscope. A description of the nucleolus is given. In addition, an unusual structure within the endometrial cell nucleolus is described, consisting of amorphous matrix, 150-A dense granules, and a series of tubular channels. This structure is named the nucleolar channel system. A description is given of the geometric variability of the nucleolar channel system, its contents, and its relationship to the cytoplasm. The morphologic basis for a nucleolar-cytoplasmic interrelationship via the nucleolar channel system is described. Some of the implications of this relationship are discussed. The work of previous investigators on the nucleolar channel system is discussed.
D002466:Cell Nucleolus; D002467:Cell Nucleus / Q000166:cytology*; D004717:Endometrium / Q000139:chemically induced*; D005260:Female; D006003:Glycogen / Q000166:cytology; D006651:Histocytochemistry; D006801:Humans; D066298:In Vitro Techniques; D008598:Menstruation; D008854:Microscopy, Electron
D006003:Glycogen