Endometrial arteries
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Arcuate arteries located in the uterus branch out and supply blood to different layers of the uterus. These arteries meet the myometrial-endometrial junction and lead to straight and endometrial arteries.[1] The endometrium receives blood from endometrial arteries which are also called spiral arteries. Endometrial arteries proliferate rapidly and react to different hormones released. These hormones are progesterone and estrogen released by the ovaries and produced by the endocrine system.[1] The endometrial arteries not only supply blood to the endometrium but are also important during pregnancy. They are the initial site of transportation of blood from the mother to the baby.
The uterus, part of the female reproductive system, is composed of the myometrium and the endometrium. The myometrium is made of smooth tissue and the endometrium lines the uterus. The endometrium is important in pregnancy because it is involved in the development of the placenta and it is where the fertilized egg implants itself during pregnancy.[2] In the endometrium there are endometrial arteries which are also known as spiral arteries. The arcuate arteries located in the myometrium, branch out into the myometrium and then spread throughout endometrium forming endometrial arteries which is how the endometrium obtains blood.[3] Endometrial arteries are coiled and is why they are also called spiral arteries. The spiral arteries are coiled towards the upper part of the endometrium and straight towards the base of the endometrium.