Uterus endometrium, SEM
Uterus endometrium. Coloured Scanning Electron Micrograph (SEM) of the surface epithelium (endometrium) of the human uterus in the secretory phase. The exposed epithelial cell surfaces are covered in numerous microvilli. The endometrium containing openings to tubular uterine glands beneath the epithelial surface.The glands produced granules of mucus, composed of proteins and sugars, which represent the nutritive elements for a possible fertilised ovum. The secretory phase is triggered during the ovarian cycle by the hormones oestrogen and progesterone which are secreted by the ovary. Magnification: x400 when printed at 10 cm wide., by STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY
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