Intramural vascular system (vasa vasorum?) in retinal vessels.
D002319:Cardiovascular System; D006652:Histological Techniques; D006801:Humans; D009885:Ophthalmology / Q000295:instrumentation*; D012160:Retina / Q000033:anatomy & histology*; D012171:Retinal Vessels; D014651:Vasa Vasorum
OPHTHALMOLOGY/apparatus; RETINA/anatomy and histology