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Pecten oculi

fold of the pecten oculi
optic nerve (nervus opticus)
optic disc (discus n. optici)
thickened nerve fiber layer of the retina
other retina layers
choroidea
sclera/ tunica vaginalis externa of the optic nerve
basal artery
basal vein
branch of the basal vein

Transverse section of the pecten oculi of a pigeon (HE): detail of the insertion upon the optic disc

The bigger blood vessels of a fold are derived from branches of the basal artery and vein that pass through the bundels of the optic nerve to leave the eye through the scleral wall. Before leaving the eye, the basal vein receives the choroidal veins.