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=== Follicular phase-Oestrus ===
=== Follicular phase-Oestrus ===
<center><gallery widths=150px>
Image:Uterus Oestrus.jpg|Histological Section of the Feline Uterus during Oestrus- Courtesy of J.Bredl, Copyright RVC 2008
Image:Uterus Luteal Phase.jpg|Histological Section of the Feline Uterus during the Luteal Phase- Courtesy of J.Bredl, Copyright RVC 2008
Image:Uterus Anoestrus.jpg|Histological Section of the Canine Uterus during Anoestrus- Courtesy of J.Bredl, Copyright RVC 2008
</gallery></center>
*Increasing numbers of uterine glands developing and elongating within the endometrium due to the influence of Oestrogens produced by the developing follicles.
*Increasing numbers of uterine glands developing and elongating within the endometrium due to the influence of Oestrogens produced by the developing follicles.
*General increase in the thickness of the endometrium.
*General increase in the thickness of the endometrium.
*The epithelium lining the glands is Simple Columna epithelium.
*The epithelium lining the glands is Simple Columna epithelium.
=== Luteal phase ===
*The endometrium is at its maximum thickness with a large number of highly developed glands.
*The endometrium is at its maximum thickness with a large number of highly developed glands.
*This is the secretory phase for the endometrium.
*This is the secretory phase for the endometrium.
=== Anoestrus ===
* The endothelium is relatively thin with little endometrial proliferation or gland development.
* The endothelium is relatively thin with little endometrial proliferation or gland development.
** This is due to the absence of ovarian steroids oestradiol and progesterone.
** This is due to the absence of ovarian steroids oestradiol and progesterone.