. [ http://en.wikipedia.org/wiki/Iris_muscle ]

Synonyms: muscle organ of iris iris muscle iris muscle organ

This is just here as a test because I lose it

Term information



editor note

revisit this, see issue #331



taxon notes

in aves, stromal mesenchymal cells may migrate to the iris and become skeletal

The muscle cells of the iris are smooth muscle in mammals and amphibians, but are striated muscle in birds and reptiles. Many fish have neither, and, as a result, their irides are unable to dilate and contract, so that the pupil always remains of a fixed size[Romer, via WP]

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