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April 1973

Development of the Sphincter and Dilator Muscles of the Iris

Author Affiliations

New York
From the Department of Ophthalmology, Columbia University, New York.

Arch Ophthalmol. 1973;89(4):332-339. doi:10.1001/archopht.1973.01000040334016

An electron microscopic study was made of the developing sphincter and dilator muscles of irises of embryonal and neonatal rabbits. In 18- to 19-day-old embryos, the anterior epithelial layer consisted of a single row of cylindrical cells from which the sphincter and the dilator muscles were derived.