[The topography of the atrium ventriculi and its microsurgical importance]

Microsurgical anatomy of the atrial region of the side cerebral ventricles was studied on 100 brain hemispheres. The variations in the form of the atrial walls, especially the structures comprising the anterior atrial wall were analysed in respect to the microsurgical possibilities. According to the anatomical results a microsurgical approach was described: the interhemispheric transatrial approach for lesions of the trigonal atrial region. Advantages and disadvantages, possibilities and limits of this approach in comparison to alternative approaches are discussed.