Fig. 3. Reticular and extrareticular tracts of the default ascending arousal network.

Deterministic fiber tracts emanating from the reticular arousal nuclei are shown in the top panels. Fiber tracts emanating from extrareticular arousal nuclei are shown in the bottom panels. All tracts are from specimen 1 and superimposed on an axial non-diffusion-weighted (b=0) image at the level of the mid-pons. Additionally, the tracts in the ventral perspective (left column) are superimposed on a coronal b=0 image at the level of the mid-thalamus, and the tracts in the left lateral perspective (right column) are superimposed on a sagittal b=0 image located at the midline. All tracts are color-coded according to their nucleus of origin (inset, right). Abbreviations are described in Table 1.