Neuroanatomy and Neuroimaging
Neuroanatomy and neuroimaging together describe the structure of the central nervous system and the methods used to visualise it in living people. Neuroanatomy maps the cortex, subcortical nuclei, white-matter tracts and vascular supply of the brain; neuroimaging provides the structural and functional pictures through which that anatomy is observed, measured and related to function in vivo.
Definition
Neuroanatomy is the study of the structural organisation of the nervous system; neuroimaging is the set of techniques (such as magnetic resonance imaging, computed tomography, diffusion imaging and functional MRI) used to visualise that structure and its activity non-invasively.
Scope
This area orients the reader to the macroscopic organisation of the brain and the imaging modalities that reveal it. It links five topics: the cerebral lobes and cortical areas, the subcortical structures and nuclei, the white-matter tracts that connect them, the structural and functional imaging methods used to study them, and the vascular anatomy that supplies them. It is a reference overview, not clinical guidance.
Sub-topics
Core questions
- How is the human brain organised into cortical regions, subcortical nuclei, connecting tracts and vascular territories?
- Which imaging modalities reveal structure versus function, and what does each measure?
- How do anatomical organisation and imaging-based maps relate to brain function?
Key concepts
- Gross and regional neuroanatomy
- Cortical and subcortical organisation
- Structural connectivity (white-matter tracts)
- Structural versus functional neuroimaging
- Vascular territories of the brain
- Large-scale brain networks
Mechanisms
The brain is organised hierarchically: a folded cerebral cortex over deep subcortical nuclei, interconnected by white-matter tracts and supplied by an anterior and posterior arterial system joined at the circle of Willis. Imaging makes this organisation observable: magnetic resonance imaging resolves grey- and white-matter structure, diffusion imaging follows the orientation of water along fibre tracts, and functional MRI infers activity from blood-oxygen-level-dependent signal changes that follow neural activity (Ogawa et al., 1990). Automated tools then segment and label these structures from images (Fischl, 2012), letting anatomy be quantified rather than only described, and relating regional structure to distributed neurocognitive networks (Mesulam, 1990).
Clinical relevance
Neuroanatomy and neuroimaging underpin how the nervous system is localised, described and studied across the clinical neurosciences, and shared anatomical and imaging vocabularies allow findings to be communicated. This area explains the structural and methodological framework; it is educational background and not a basis for individual diagnosis or treatment.
History
Classical neuroanatomy was built from gross dissection and histology over the eighteenth and nineteenth centuries, codified in atlases such as Gray's Anatomy (Standring, 2020). The twentieth century added in-vivo imaging: X-ray computed tomography and then magnetic resonance imaging let brain structure be seen in living people, and the discovery of blood-oxygen-level-dependent contrast (Ogawa et al., 1990) opened functional imaging. Computational segmentation later turned images into quantitative anatomical measurements (Fischl, 2012).
Key figures
- Marsel Mesulam
- Bruce Fischl
- Seiji Ogawa
Related topics
Seminal works
- ogawa-1990
- mesulam-1990
- fischl-2012
Frequently asked questions
- What is the difference between neuroanatomy and neuroimaging?
- Neuroanatomy is the description of brain structure itself; neuroimaging is the set of methods used to visualise that structure, and increasingly its activity, in living people.
- Does structural imaging show brain activity?
- No. Structural imaging shows anatomy, while functional imaging such as functional MRI infers activity indirectly from blood-oxygenation-related signal changes that accompany neural activity.