part of part of has part has part characteristic of inheres in has modifier Abnormal retinal arterial/arteriolar morphology Focal retinal arteriolar constriction UMLS:C2176208 Retinal arteriolar constriction HP:0007952 HP:0008510 Focal decreased retinal arteriolar diameters, which may decrease blood flow and slow oxygen delivery to regions of the retina. HP:0008043 Constricted retinal arterioles Narrow retinal arterioles Retinal arteriolar narrowing Usually after the first branch, the retinal arteries contain no elastic fibers and the term retinal arteriole is more appropriate. The main changes seen in diseases such as hypertension affect mainly the retinal arterioles rather than the retinal artery. abnormal constricted retina arteriole