part of part of connecting branch of Homo sapiens system myometrium uterine artery helicine branch of uterine artery arcuate artery of uterus helicine arteriole Notes: The straight branches of the radial arteries of the uterus terminate in capillaries in the basal layer, while the spiral or coiled branches penetrate to the surface epithelium The helicine branches of uterine artery (or helicine arterioles, or spiral arteries) are small arteries which temporarily supply the endometrium of the uterus during the luteal phase of the menstrual cycle. In histology, identifying the presence of these arteries is one of the most useful techniques in identifying the phase of the cycle. helicine artery of uterus spiral arteries UBERON:0015173 rami helicini uterinae spiral artery Wikipedia:Helicine_branches_of_uterine_artery FMA:21101 helicine artery