Hyaloid vascular pattern in the human fetus.

The hyaloid vascular system of developing human eyeballs is studied to elucidate the relationship to the retinal vascular patterns. The process of the regression of the hyaloid vascular system in fetuses consisted of gradual shrinkage of the wall of the vessels with lessening of the lumen and eventually, thread-like acellular strands that remained as a consequence. The intercapillary bridge in the retinal vessel appeared to be a remnant of the degenerated vessel as in the hyaloid vascular system. At the ninth month of intra-uterine life, the regression of the hyaloid vascular system was almost complete.