aseg: FreeSurfer Automatic Subcortical Segmentation Atlas

In ggseg.formats: Brain Atlas Data Structures for the 'ggsegverse' Ecosystem

FreeSurfer Automatic Subcortical Segmentation Atlas

Description

Returns the FreeSurfer automatic subcortical segmentation (aseg) atlas containing deep brain structures including the thalamus, caudate, putamen, pallidum, hippocampus, amygdala, accumbens, and ventricles.

Usage

aseg()

Details

This atlas is derived from FreeSurfer's aseg.mgz volumetric segmentation. It works with both ggseg (2D slice views) and ggseg3d (3D mesh visualizations) from a single object.

Value

A ggseg_atlas object with components:

atlas

Character. Atlas name ("aseg")

type

Character. Atlas type ("subcortical")

palette

Named character vector of colours for each region

data

A ggseg_data_subcortical object containing:

meshes

Data frame with label and mesh columns

sf

Simple features data frame for 2D rendering

Structures

The atlas contains bilateral structures:

• Thalamus

• Caudate

• Putamen

• Pallidum (globus pallidus)

• Hippocampus

• Amygdala

• Accumbens (nucleus accumbens)

• Ventral diencephalon

Plus midline and ventricular structures:

• Lateral ventricles

• Third ventricle

• Fourth ventricle

• Brain stem

• Cerebellar cortex

• Cerebellar white matter

References

Fischl B, Salat DH, Busa E, et al. (2002). Whole brain segmentation: automated labeling of neuroanatomical structures in the human brain. Neuron, 33(3):341-355. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1016/S0896-6273(02)00569-X")}

See Also

dk() for cortical parcellation, ggseg_atlas() for the atlas class constructor

Other ggseg_atlases: dk(), suit(), tracula()

Examples

aseg()
plot(aseg())
atlas_regions(aseg())

ggseg.formats documentation built on July 2, 2026, 5:07 p.m.