Optic nerve and peripapillary choroidal microvasculature in the primate

Area of Science:

• Ophthalmology
• Neuroscience
• Anatomy

Background:

• The blood supply to the optic nerve and surrounding structures is crucial for vision.
• Previous studies have presented conflicting information regarding choroidal involvement in optic nerve vascularization.

Purpose of the Study:

• To elucidate the three-dimensional angioarchitecture of the monkey optic nerve and peripapillary choroid.
• To clarify the vascular pathways and their contribution to the optic nerve's blood supply.

Main Methods:

• Utilized methylmethacrylate corrosion microvascular casting technique.
• Performed scanning electron microscopy for detailed visualization of vascular networks.
• Examined the optic nerve and peripapillary choroid in primate models.

Main Results:

• Demonstrated a centripetal blood supply to the optic nerve from peripheral arteries (short posterior ciliary arteries) towards central venous drainage (central retinal vein).
• Identified a marginal arterial ring formed by choroidal branches of short posterior ciliary arteries supplying the peripapillary choroid.
• Observed large choroidal veins draining the peripapillary region, originating approximately 300 micrometers from the optic nerve margin.

Conclusions:

• The study provides a detailed 3D map of the optic nerve and peripapillary choroidal vasculature in primates.
• Revisits and potentially resolves controversies concerning the role of choroidal circulation in optic nerve blood supply.
• Offers insights into primate optic nerve vascular anatomy for comparative studies with non-primates.