Content
MeSH Tree Structures
Some terms appear in more than one branch of the tree. For example:
- Anatomy
- Body Regions
- Head
- Ear
- Head
- Body Regions
- Anatomy
- Sense Organs
- Ear
- Ear, External +
- Ear, Middle +
- Ear, Inner +
- Ear
- Sense Organs
The hierarchy allows a MEDLINE/PubMed search of a broader term to include the narrower terms in all branches automatically. This is known as "exploding." For example, a search of ear in PubMed would automatically explode to include records indexed with Ear, External; Ear, Middle; and Ear, Inner, as well as all narrower terms under each of these.
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