What is the difference between a MeSH concept and a MeSH descriptor
MeSH is organized into Descriptor &gt; Concept &gt; Term hierarchy, where all the synonymous &lt;term&gt;'s are grouped together under a &lt;concept&gt;. For example, consider the MeSH terms,


Blood-Brain Barrier
Hemato-Encephalic Barrier
Brain-Blood Barrier


All these terms are group under the umbrella concept of "Blood-brain barrier".