Neuroendoscopic anatomy of transcallosal-interforniceal approach

Objective:To offer anatomical data for transcallosal-interforniceal approach in neuroendoscopic surgery.Methods:The relative anatomical structures were observed and recorded in 25 adult antiseptic cadaveric head specimens imitating transcallosal-interforniceal approach by operating microscope and neuroendoscopic.Results:The thickness of callosum was about(7.22±0.32)mm under bregma.The distance was about(8.65±1.64)mm from fornix to inferior margin of callosum.Camera septi pellucidi was found in 19 cadaveric heads(76%).Adhesio interthalamica was absent in 6 heads(24%).The anatomic features of the third ventricle were observed by interforniceal approach.The important road mark in the third ventricle included choroid plexus,anterior and posterior commissure,infundibular recess,interthalamic adhesion,the opening of aqueductus mesencephali and so on.Conclusions:The structures of the third ventricle and pineal area could be shown clearly by using neuroendoscop.The normal anatomic structures can be protected by transcallosal-interforniceal approach under neuroendoscope.