Glycogen is secreted into the lumen of the glands. Secretion into the glands begins to decline. The stroma begins to condense around the spiral arterioles. By Day 28 small areas of stromal haemorrhage are seen. The epithelium of the vagina is of the non-keratinised, stratified squamous variety.
Leucocytes are abundant, red blood corpuscles, and endometrial cells are also common.
Leucocytes are absent. Acidophilia of the cytoplasm has increased. Leucocytes still absent. These are the navicular cells with folding of their edges, and they are commonly found in clusters. Leucocytes and bacteria increase from day 23 along with mature superficial cells.