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STRUCTURE OF THE IRIS

Neurology

STRUCTURE OF THE IRIS

The iris is a contractile structure, consisting of 2 groups of muscles:

1. Sphincter pupillae - circular group of muscles, innervated by the Short Ciliary nerves (branch of the ciliary ganglion); constrict the pupil to parasympathetic stimulation.

2. Dilator pupillae - radial group of muscles, innervated by the Long Ciliary nerves; dilate the pupil to sympathetic stimulation.


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REFERENCES

1. Wilkinson, I. (2017). Oxford handbook of clinical medicine. Oxford: Oxford University Press.
2. Hannaman, R. A., Bullock, L., Hatchell, C. A., & Yoffe, M. (2016). Internal medicine review core curriculum, 2017-2018. CO Springs, CO: MedStudy.
3. Image: no reference available.

Ⓒ A. Manickam 2018

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