The Structure of Fetal Hyaloid System and Tunica Vasculosa Lentis

Abstract

Introduction The intraocular blood system in the human fetus eye was studied by light microscopy. The distilled water¹ and trypsin digestion² methods were employed to visualize the hyaloid artery and the capillaries of the tunica vasculosa lentis of the human fetus eye. Method Seventeen eyes from nine human fetuses whose ages varied from 16 to 36 weeks were used for the study. Eyes were kept in 10% formalin for two to five days for fixation after removing from the fetus. A small window was cut through the scleral wall, choroid, and retina of the eye until the vitreous was reached. The first observation of the hyaloid artery and its branches was done under the low-power magnification of a light microscope through this window. Then the whole hyaloid artery and entire tunica vasculosa lentis were gently removed from the fetus eye by careful dissection of the tissues with a