Abstract
Abstract: The ultrastructure of Corpus luteum and the different cell types in the functional corpus luteum of the bat were studied using the electron microscope. Two types of luteal cell, a large and small, were present in the corpus luteum of this species of bat. The large more rounded luteal cell possessed numerous cell organelles such as mitochondria and electron dense membranebound granules, agranular endoplasmic reticulum and granular endoplasmic reticulum which at times appeared as stacks of cisternae. With this lipid droplets were present in the luteal cell cytoplasma while whorled agranular endoplasmic reticulum was absent. Small luteal cell present amongs the large luteal cells with tapering cytoplasmic processes. These cells differed from the large luteal cells in that they possessed fewer mitochondria and electron dense membrane- bound granules. Occasional nuclei of the small luteal cells contained cytoplasmic inclusion bodies
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