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June 1955

The Anterior Border king of Schwalbe and the Pectinate Ligament: Embryologic and Comparative Anatomic Studies

Author Affiliations

Iowa City
From the Department of Ophthalmology, State University of Iowa College of Medicine.

AMA Arch Ophthalmol. 1955;53(6):799-806. doi:10.1001/archopht.1955.00930010807003

EMBRYOLOGY  In a previous paper1 it was shown that no tissue requiring atrophy and resorption is present in the typical chamber angle of the embryonic or fetal eye. A comparison of cell layer counts in fetal and adult eyes showed that there is on the average an increase in the number of cell layers between Schlemm's canal and the pigment epithelium of the ciliary body during the period of cleavage of the angle. The increase appears to be entirely within the ciliary-iris tissue. By contrast, the increase in size of the mass of trabecular tissue and the ring of Schwalbe seems to be due to cell growth and cavitation.To say that no tissue requiring atrophy is present in the average fetal angle does not mean that excessive tissue is not present in a certain percentage of cases. Excessive embryonic mesoderm is seen, but only approximately in the same