胎儿视网膜中央动脉的显微外科解剖

MICROSURGICAL ANATOMY OF THE CENTRAL RETINAL ARTERY OF THE FETUS

The central retinal arteries were studied in 32 eyes obtained from 16 fetuses. (7-8 months old)with the stereoscopy for the microsurgical anatomy.4 eyes obtain- ed from 2 fetuses of the same age were injected by A.B.S.,the casts were used for the contrast study. The central retinal artery of the fetus was divided into the intraorbital portion, the intravaginal portion,the intraneural portion and the portion of the lamina cri- brosa and the pre-lamina cribrosa of the sclera.All four portions gave off branches to supply the optic nerve and its sheath. The central retinal artery of the fetus developed very well,its incidence was 100%,its average caliber was 0.42 mm. The central retinal artery of the fetus gave off the posterior ciliary branch (9.4%)which anastomosed with the Zinn-Haller circle.It forms another communi- cation between the central retinal artery and posterior ciliary branch.