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Rachel V Thomas

Indian Researchers Release World’s Most Detailed 3D Atlas of Human Brainstem

Researchers at the Indian Institute of Technology Madras (IIT Madras) have released the world’s most detailed 3D atlas of the human brainstem.

Called ANCHOR (Atlas of Neurochemical Characterization of the Human Brainstem with 3D Reconstruction), the atlas was developed using a high-throughput brain imaging and computing platform that transforms whole human brains into 3D cell-resolution atlases. 

It provides comprehensive multi-modal 3D maps of the human brainstem across the lifespan, covering the prenatal period, childhood, and adulthood. 

The atlas includes more than 200 brainstem nuclei and fiber tracts reconstructed from hundreds of serial sections. To identify distinct neurochemical cell types, researchers overlaid eight complementary immunostains across more than 500 sections, enabling detailed mapping. 

Developed by the Sudha Gopalakrishnan Brain Centre (SGBC) at IIT Madras, ANCHOR has been made publicly available to researchers, clinicians, and patients worldwide. 

“This is a significant accomplishment in the field of neurobiology. This is a multimodal framework integrating MRI, histology, and detailed chemo-architecture. It will be the most detailed and comprehensive maps of the human brainstem, and made available publicly in digital form. These maps will help in identifying specific cell populations affected in brain stem lesions, which could be critical for clinical applications,” said Prof. Ajay Kumar Sood, Principal Scientific Adviser to the Government of India, during the 3rd BRICS Neuroscience Symposium 2026.

Prof. Mohanasankar Sivaprakasam, Head of SGBC, IIT Madras, said the atlas uses a multimodal image visualization framework that integrates volumetric MRI data with cellular-level images. 

“By establishing precise spatial correspondence across these modalities, the atlas enables a seamless transition from gross brain structures in the MRI to cellular-level features. We envision that these maps and atlases will have significant implications for neuroscience and neuromedicine,” he said.

Also read: <a href="https://www.healthandme.com/health-news/india-ai-summit-union-health-minister-nadda-launches-sahi-and-bodh-initiatives-to-boost-ai-in-healthcare-article-153630480" data-type="tilCustomLink">India AI Summit: Union Health Minister Nadda Launches SAHI And BODH Initiatives To Boost AI In Healthcare</a>

The human brainstem contains more than 200 nuclei and fiber tracts and plays a vital role in regulating essential body functions. 

ANCHOR is an online platform featuring more than 800 serial histological sections stained for Nissl and seven immunochemical (IHC) markers from three human brainstems representing different stages of life: 

<ul><li>25 fetal gestational weeks </li><li>9 years old </li><li>54 years old </li></ul>Researchers identified and manually annotated more than 200 structures across these specimens and further characterized them using the seven IHC markers.

The atlas also describes catecholaminergic groups across all three age groups, identifies the protoplasmic commissural dendrites of the hypoglossal nucleus, and describes the pretectal nuclei in the fetal brainstem. 

Read More:<a href="https://www.healthandme.com/health-news/79th-world-health-assembly-india-created-over-880-million-digital-health-ids-says-j-p-nadda-article-154352948" data-type="tilCustomLink">79th World Health Assembly: India Created Over 880 Million Digital Health IDs, Says J P Nadda</a>

ANCHOR includes an online viewer that integrates: 

<ul><li>Magnetic resonance imaging (MRI) </li><li>Block-face imaging </li><li>Nissl-stained serial sections </li><li>IHC-stained serial sections </li><li>3D reconstruction of the entire brainstem.</li></ul>

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3D Atlas of Human Brainstem

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Researchers at the Indian Institute of Technology Madras (IIT Madras) have released the world’s most detailed 3D atlas of the human brainstem. Called ANCHOR (Atlas of Neurochemical Characterization of the Human Brainstem with 3D Reconstruction), the atlas was developed using a high-throughput brain imaging and computing platform that transforms whole human brains into 3D cell-resolution atlases. It provides comprehensive multi-modal 3D maps of the human brainstem across the lifespan, covering the prenatal period, childhood, and adulthood. The atlas includes more than 200 brainstem nuclei and fiber tracts reconstructed from hundreds of serial sections. To identify distinct neurochemical cell types, researchers overlaid eight complementary immunostains across more than 500 sections, enabling detailed mapping. Developed by the Sudha Gopalakrishnan Brain Centre (SGBC) at IIT Madras, ANCHOR has been made publicly available to researchers, clinicians, and patients worldwide. “This is a significant accomplishment in the field of neurobiology. This is a multimodal framework integrating MRI, histology, and detailed chemo-architecture. It will be the most detailed and comprehensive maps of the human brainstem, and made available publicly in digital form. These maps will help in identifying specific cell populations affected in brain stem lesions, which could be critical for clinical applications,” said Prof. Ajay Kumar Sood, Principal Scientific Adviser to the Government of India, during the 3rd BRICS Neuroscience Symposium 2026. Prof. Mohanasankar Sivaprakasam, Head of SGBC, IIT Madras, said the atlas uses a multimodal image visualization framework that integrates volumetric MRI data with cellular-level images. “By establishing precise spatial correspondence across these modalities, the atlas enables a seamless transition from gross brain structures in the MRI to cellular-level features. We envision that these maps and atlases will have significant implications for neuroscience and neuromedicine,” he said. Also read: India AI Summit: Union Health Minister Nadda Launches SAHI And BODH Initiatives To Boost AI In HealthcareWhat Is ANCHOR? The human brainstem contains more than 200 nuclei and fiber tracts and plays a vital role in regulating essential body functions. ANCHOR is an online platform featuring more than 800 serial histological sections stained for Nissl and seven immunochemical (IHC) markers from three human brainstems representing different stages of life: 25 fetal gestational weeks 9 years old 54 years old Researchers identified and manually annotated more than 200 structures across these specimens and further characterized them using the seven IHC markers. The atlas also describes catecholaminergic groups across all three age groups, identifies the protoplasmic commissural dendrites of the hypoglossal nucleus, and describes the pretectal nuclei in the fetal brainstem. Read More:79th World Health Assembly: India Created Over 880 Million Digital Health IDs, Says J P NaddaIntegrated Online Viewer ANCHOR includes an online viewer that integrates: Magnetic resonance imaging (MRI) Block-face imaging Nissl-stained serial sections IHC-stained serial sections 3D reconstruction of the entire brainstem.

indian researchers release world’s most detailed 3d atlas of human brainstem

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Indian Researchers Release World’s Most Detailed 3D Atlas of Human Brainstem

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