Scientists at the Sudha Gopalakrishnan Brain Centre (SGBC), IIT Madras have created ANCHOR (Atlas of Neurochemical Characterisation of the Human Brainstem with 3D Reconstruction), which they describe as the world's most detailed 3D atlas of the human brainstem at cellular resolution.
The atlas was built using over 500 tissue sections from fetal, childhood, and adult brains. It enables researchers to seamlessly zoom from MRI scans of the entire brain down to individual neurons, bridging the long-standing gap between medical imaging and microscopic brain anatomy.
The brainstem, although small, controls vital functions such as breathing, heartbeat, sleep, movement, and consciousness.
ANCHOR identifies more than 200 clusters of brain cells and nerve pathways using eight neurochemical markers, providing one of the clearest maps ever created of this complex region. Unlike expensive molecular mapping techniques, it relies on high-resolution microscopic images, making it more accessible and cost-effective.
The atlas is not a diagnostic tool, but researchers believe it could significantly advance the study of neurological disorders such as Alzheimer's disease, Parkinson's disease, stroke, autism, sudden infant death syndrome (SIDS), and long-term neurological effects of Covid-19. It may also help neurosurgeons perform safer brainstem surgeries by providing a more precise anatomical guide.
The project involved around 20 scientists working for 18 months, while the SGBC now has a team of over 200 researchers, engineers, and technicians collaborating globally. The atlas has been made freely available online to support neuroscientists worldwide.
Looking ahead, the IIT Madras team plans to map more than 100 whole human brains across different ages and neurological conditions, including Alzheimer's and dementia, to create a comprehensive reference library that could transform our understanding of how diseases affect the human brain at the cellular level.
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