The Indian Institute of Technology Madras has introduced a high-resolution 3D atlas of the human brainstem, marking a significant advancement in neurobiological mapping. Known as ANCHOR, or the Atlas of Neurochemical Characterisation of the human brainstem with 3D Reconstruction, the project provides a multi-modal framework that integrates MRI data with detailed histological analysis.
Developed by the Sudha Gopalakrishnan Brain Centre at IIT Madras, the atlas maps more than 200 brainstem nuclei and fiber tracts. Researchers constructed these models by processing hundreds of serial sections, utilizing eight complementary immunostains to differentiate specific neurochemical cell types across the human lifespan. The data spans prenatal development through childhood and adulthood, offering a longitudinal perspective on brainstem architecture.
The project represents a collaborative effort involving more than 200 researchers, engineers, and technicians. The team worked alongside 20 international partners to refine the imaging and computing platform required for such high-throughput data processing. This interdisciplinary approach combines expertise from engineering, neuroscience, and clinical medicine to ensure technical precision.
Public accessibility remains a core component of the initiative, with the data now available through a dedicated digital portal. By providing open access to these maps, the Sudha Gopalakrishnan Brain Centre aims to facilitate broader research into brainstem lesions and neurological conditions. The platform serves as a resource for clinicians and scientists seeking to identify specific cell populations affected by disease.
The release occurred during the 3rd BRICS Neuroscience Symposium 2026, held at the IIT Madras campus. Prof. Ajay Kumar Sood, the Principal Scientific Adviser to the Government of India, officially presented the atlas. He noted that the project builds upon the success of the centre’s previous work, known as DHARANI, which was released last year.
Various medical institutions, including CMC Vellore and Kilpauk Medical College, contributed to the project by providing human brain specimens. This multi-institutional cooperation allowed the team to acquire diverse samples necessary for creating a representative atlas. The resulting data provides a standardized reference for studying both healthy brain structures and those altered by pathology.
The brainstem serves as a vital conduit between the brain and the spinal cord, regulating essential physiological functions such as respiration, sleep cycles, and motor control. Prof. Mu-Ming Poo, Scientific Director at the Institute of Neuroscience, Chinese Academy of Sciences, emphasized that the decision to focus on the brainstem provides a foundational understanding of these critical regulatory centers. The integration of macro-scale volumetric data with micro-scale cellular images allows for a continuous transition between different levels of biological observation.
Prof. Mohanasankar Sivaprakasam, Head of the Sudha Gopalakrishnan Brain Centre, stated that the platform establishes precise spatial correspondence across multiple imaging modalities. This technical achievement enables researchers to correlate gross anatomical structures seen on MRI scans with specific cellular features. The centre intends to expand this methodology to image over 100 whole brains to further investigate the progression of neurological disorders.
The project highlights the efficacy of combining public agency funding with private and philanthropic support to sustain long-term scientific endeavors. By fostering an environment where engineering talent meets clinical necessity, the researchers have created a scalable model for large-scale brain science. This infrastructure is expected to support future studies on neurodegenerative diseases, including dementia and Alzheimer’s disease, by providing a baseline for structural comparison.
Future efforts will focus on expanding the atlas to include more diverse neurological profiles and disease states. The research team continues to refine their imaging techniques to improve the resolution and accuracy of the 3D reconstructions. As the database grows, it will likely become a standard reference tool for neuroscientists worldwide, potentially influencing diagnostic and therapeutic strategies for brainstem-related conditions. The ability to map cellular changes in the brainstem offers a new pathway for understanding how specific pathologies manifest at the microscopic level.
