Iris sphincter muscle Iris sphincter muscle The iris sphincter muscle (pupillary sphincter, pupillary constrictor, circular muscle of iris, circular fibers) is a muscle in the part of the eye called the iris. It encircles the pupil of the iris, appropriate to its function as a constrictor of the pupil. It is found in vertebrates and some cephalopods. Initially, all the myocytes are of the smooth muscle type but, later in life, most cells are of the striated muscle type. Its dimensions are about 0.75 mm wide by 0.15 mm thick. In humans, it functions to constrict the pupil in bright light (pupillary light
What Is History? for relations with the Soviet Union. Carr commented that were it only the English translation of "Stresemanns Vermächtnis" that had survived World War II, then historians would have been seriously misled about what Stresemann had been up to as Foreign Minister. Finally Carr argued that in the conversations between Stresemann and the Soviet Foreign Commissar Georgy Chicherin, Stresemann does most of the talking and says all of the intelligent and original things, leading Carr to suggest that Stresemann himself had edited the papers to place himself in the best possible light. Carr used "Stresemanns Vermächtnis" to argue for the subjective