All prepapillary arterial loops are not alike.
Jampol
L M
LM
Marmor
M F
MF
D006801:Humans; D009898:Optic Disk / Q000098:blood supply*; D012161:Retinal Artery / Q000473:pathology*; D015356:Retinal Artery Occlusion / Q000150:complications*; D012164:Retinal Diseases / Q000209:etiology* / Q000473:pathology