Scientists at the Sudha Gopalakrishnan Brain Centre (SGBC) at the Indian Institute of Technology, Madras (IIT-M) have developed the world's most detailed 3D atlas of the human brainstem at cellular resolution. Named Anchor (Atlas of Neurochemical Characterisation of the Human Brainstem with 3D Reconstruction), this digital map allows seamless navigation from whole-brain MRI scans down to individual nerve cells.

Anchor combines over 500 tissue sections from various age groups, utilizing high-resolution microscope images rather than expensive molecular techniques. It identifies more than 200 clusters of brain cells and nerve pathways, using eight chemical markers to distinguish cell types. The brainstem, crucial for vital functions like breathing and heartbeat, has long been difficult to map due to its dense architecture.

This atlas bridges the gap between medical imaging and cellular pathology. Neuroscientist Shubha Tole described it as an "unprecedented integration." The researchers hope Anchor will become a vital reference for neuroscientists, neurologists, and neurosurgeons, aiding in the understanding of disorders like Alzheimer's, Parkinson's, and stroke, and potentially improving surgical precision. The atlas is freely available online.