A slender branch of a chorionic stem villus. A chorionic mature intermediate villus lacks fetal arterioles and venules in the stroma, which is composed of slender fetal capillaries embedded into a loose connective tissue that is rich in cells but poor in fibers. It exhibits a diameter ranging from 60 to about 100 μm. [ http://www.ncbi.nlm.nih.gov/pubmed/21452443 doi:10.1007/978-3-030-84725-8 ]