part of part of medulla of organ ovary reproductive structure ovarian medulla Highly vascular stroma found in the center of the ovary that forms from embryonic mesenchyme and contains blood vessels, lymphatic vessels, and nerves; this stroma forms the tissue of the hilum by which the ovarian ligament is attached, and through which the blood vessels enter; it does not contain any ovarian follicles. medulla of ovary zona vasculosa of Waldeyer FMA:18616 UBERON:0013192 UMLS:C0227879 medulla ovarii (zona vasculosa) Wikipedia:Medulla_of_ovary EMAPA:37928 composed of loose connective tissue that contains blood vessels, lymph vessels and nerves NCIT:C33245