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Uterine horn of sheep with caruncles.
Description:This is a low power picture of the uterine horn from a sheep. The endometrium has caruncles and glandular regions. The inner muscle layer of the myometrium can be seen between the endometrium and the vascular layer (stratum vasculare). The caruncles appear to be "bare" at low magnification. It is covered by the surface epithelium and is rich in fibrocytes and has an extensive blood supply (not obvious here). These structures, found in ruminants, are sites of attachment of the maternal (endometrail) placenta to the fetal placenta (cotyledons). PK1471. Original mag. 5x. Masson trichrome. Uterus. Female Reproductive System. Sheep.