Hierarchies define the organization of structures - from large (organisms) to small (molecules).
The figure illustrates a structural hierarchy for organs.
The figure illustrates a structural hierarchy for the brain and spinal cord.
This table lists the more than 13,000 structural hierarchies used to populate the literature database.
To find where a structure lives in the hierarchy, type its name into the global data entry field and press Enter. Then click on the yellow fields until it appears in the data window.