# 17.2 T MRI atlas of the mouse hypothalamus shows sex differences in anatomy and neurochemistry

- Published: 2026-11-07 16:59 UTC
- Section: Life & Health › Neurotechnology
- Tags: ultra-high-field MRI, 17.2 tesla, mouse hypothalamus, MRI HypoAtlas, diffusion MRI, tractography, resting-state fMRI, magnetic resonance spectroscopy, sexual dimorphism, hypothalamic nuclei
- URL: https://realtech.media/news/rt-4b217ce585cf3957f3b572a1_17_2_t/

**Researchers in France combined structural, diffusion, functional and spectroscopic MRI at 17.2 T in mice, resolving hypothalamic nuclei earlier unseen by MRI.**

![17.2 T MRI atlas of the mouse hypothalamus shows sex differences in anatomy and neurochemistry](https://realtech.media/media/2026/11/3f01d181d677951c.jpg)
*U.S. Department of Energy from United States, Wikimedia Commons, Public domain*

A team from Université de Lille, Inserm and CHU Lille, together with Université Paris-Saclay, CEA, Neurospin (France), used ultra-high-field magnetic resonance imaging at 17.2 tesla to study the mouse hypothalamus, according to a paper in Nature Communications published on 6 November 2026 [1]. The authors note that structural and functional study of the hypothalamus is hampered by its small size and deep location. They obtained structural, functional and neurochemical images of it at high spatial resolution [1].

## Atlas and pathways

From high-resolution ex vivo anatomical data the authors built the MRI HypoAtlas. They report that it improves on existing resources and reveals hypothalamic nuclei that MRI had not resolved before [1]. Diffusion MRI with tractography mapped pathways inside the hypothalamus and between it and other brain regions. According to the authors, this makes circuit-level exploration possible without a priori assumptions [1].

## Function, neurochemistry and sex differences

Resting-state fMRI combined with independent component analysis identified hypothalamic networks that the authors describe as novel. They present this as a demonstration that ultra-high-field MRI is better at detecting deep-brain activity [1]. Proton magnetic resonance spectroscopy (¹H-MRS) quantified neurochemical profiles and showed sexually dimorphic heterogeneity within the hypothalamus [1].

Across the imaging modalities, the authors found sex differences in hypothalamic anatomy, microstructure and neurochemistry [1]. They say this supports the added value of the methodological advances. The work is offered as a resource for studying hypothalamic circuits and functions, with relevance to neuroendocrine regulation, behavior and disease mechanisms; the authors describe its translational relevance as direct.

The first authors are Alicia Sicardi and Pierre Labouré-Santavicca. Vincent Prévot and Luisa Ciobanu are the corresponding authors.

## Sources

1. [Nature Communications](https://doi.org/10.1038/s41467-026-79208-y)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-4b217ce585cf3957f3b572a1_17_2_t/