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Decussation is used in biological contexts to describe a crossing. (In Latin anatomical terms the form decussatio is used, e.g. decussatio pyramidum) In anatomy the term chiasma or chiasm means much the same as decussation.
- In the brain, where nerve fibers obliquely cross from one lateral part to the other, that is to say they cross at a level other than their origin. See for example Decussation of pyramids.
- In phyllotaxis when an opposite pattern of leaves has successive leaf pairs that are perpendicular, it is called decussate. In effect, successive pairs of leaves cross each other.
- In tooth enamel, where bundles of rods cross each other as they travel from the enamel-dentine junction to the outer enamel surface, or near to it.
- Stedman, Thomas Lathrop. A practical medical dictionary. Publisher: New York, W. Wood 1920. May be downloaded at http://archive.org/details/cu31924052393315
See also 
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