ABSTRACT
The posterior portion of Willis' circle and the posterior cerebral artery of 50Chinese brains(40 adults and 10 children)were systematically studied.The hypoplastic posterior communicating artery was found in 56.0%?4.96.The posterior communicating artery gave off,in average,5.3 perforating branchesto the hypothalamus and 3.5 perforating branches to the posterior perforatingsubstance.The posterior cerebral artery was divided into 3 segments:P_1, P_2 and P_3.The segment P_1 of the posterior cerebral artery gave off,in average,1.8thalamoperforating branches to the interpeduncular fossa and 0.9 mamillary branchto the mamillary body.The segment P_2 gave off direct perforating branches,whichwere divided into 3 groups:in average 4.3 branches to the cerebral peduncule,1.0branch to the pulvinar and brachium quadrigeminum superius and 5.4 thalamogeni-culate branches.Moreover,the posterior cerebral artery also sent short circumflex branches tothe mesencephalic tegmentum,long circumflex branches to the mesencephalic tectum,medial posterior choroidal arteries to the choroid plexus of the third ventricle andlateral posterior choroidal arteries to the choroid plexus of the lateral ventricle.The blood stream of the segment P_2 mainly came from the basilar artery in79.0%?4.07,from the internal carotid artery in 4.0%?1.96 and equally from bothof them in 17.0%?3.76.The posterior cerebral artery sent off five cortical branches,and was mainlydistributed to the inferior surface of a temporal lobe and the medial surface of anoccipital lobe.
ABSTRACT
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 usedfor 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 branchesto supply the optic nerve and its sheath.The central retinal artery of the fetus developed very well,its incidence was100%,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.
ABSTRACT
The supraclinoidal segments of 50 carotid internal arteries were studied in 25 adult cadavers.The supraclinoidal segment was divided into the ophthalmic arterial por- tion,the communicational arterial portion and the choroidalarterial portion.The ophthalmic arterial portion of the supraclinoidal segment sent off the ophthalmic artery,the superior hypophyseal artery and the hypothalamic branch.The microsur- gical anatomy of the ophthalmic artery was specially studied.
ABSTRACT
The petrous and the cavernous segments of 50 internal carotid arteries were examined in 25 adult cadavers.The petrous segment was divided into two portions, namely,the vertical portion and the horizontal portion.The two portions joined at the genu.No branch was found on the vertical portion.The horizontal portion sent off the pterygoid artery and the periosteal artery.Moreover,a surgical approach to the petrous segment of the internal carotid artery was explained. The cavernous segment was divided into the posterior acscending portion,hori- zontal portion,anterior ascending portion,posterior curve and anterior curve.The cavernous segment sent off two main branches,namely,the meningohypophyseal trunk and the artery of the inferior cavernous sinus.Moreover,a rare case of the persistent trigeminal artery was reported.