Submersion method for neuroanatomical photography: visualizing arachnoid membranes and cisterns

IntroductionThe subarachnoid space expands into cisterns, limited by arachnoid membranes. Dissection within these compartments is the hallmark of microneurosurgeons, working in-vivo, within the head, with the brain bathed in cerebrospinal fluid, under magnification, and extra-illumination. Other study methods cannot reproduce these conditions, and ex-vivo anatomy proves inadequate, as cisterns collapse, impairing recognition of delicate sheaths, limiting comprehension, and creating a knowledge gap that starts during graduation.ObjectiveThis technical report (CAAE: 94582325.1.0000.5208) presents a photographic method that restores cisternal configuration through submersion.MethodsTwenty-two brains were obtained with informed consent during routine autopsies. After intravascular rinsing and fixation in formalin, specimens were submerged in water within black containers to re-expand subarachnoid spaces. Arachnoid membranes were marked with color-coded pins. High-resolution photographs were acquired using a dual 12 MP camera system (wide f/1.6 with sensor-shift stabilization; ultra-wide f/2.4, 120° field of view, Apple Inc., Cupertino, USA). Two light sources minimized glare and reflection.ResultsSubmersion restored the three-dimensional configuration of cisterns, allowing visualization of the arachnoid membranes including: Liliequist’s, lateral pontomesencephalic, anterior pontine and medial and lateral pontomedullary and carotid membranes. The photographic protocol produced detailed images that facilitated recognition of cisternal boundaries and membrane orientation.ConclusionsThis submersion-based photographic method provides a simple, low-cost, and reproducible approach for neuroanatomical documentation and is particularly useful in depicting the arachnoidal cisterns. By approximating intraoperative conditions through submersion, it enables students and residents to visualize and comprehend complex arachnoid structures. This approach may improve anatomical proficiency and facilitate neurosurgical training.