Abstract
The ora serrata is the frontal part of the parsoptics retinae, contacting the pars plana epithelium and forming saw-toothed processes. These processes are called the teeth of the ora serrata and the part where pars plana epithelium curves backward between the teeth is called the bay of the pars plana. Since there has recently been a great improvement in examination instruments, there has been a tendency for physicians to pay more attention to the conditions of the peripheral and the surrounding areas, particularly the relation ofthese part to the retinal detachment. However, there have not been many reports onanatomical studies of theoraserrata, so I examined theoraserrata of 70 eyes on the standpoint ofclinical anatomy.
The eyeballs removed from the cadavers were cut into two by a razor along the line of the equator. Theoraserrata's tooth and the bay were examined under astero-microscope and sketched. As for the teeth and bays distributions, the 8-division-method (nasal-side, I-IV, temporal side, V-VIII) was used, and for the width of the bay and the length of the teeth, a digital microscope (the minimum readable value, 0.001mm the range of measurement, 0-25mm) was used.
The total number of teeth on the 70 eyes was 1123, the average per eye, 16.0. The re gion of the highest distribution out of the 8 divisions was the upper part of the nasal-side “II”, where the average was 3.2, and the least distributed region was the temporal side lower side “VI”, where the average was 0.5. The highest number of teeth on one eye was 34, the least, zero. The total number of bays was 859, the average per eye, 12.3. The region of the highest distribution out of the 8 divisions was, as in the case of teeth, the nasal side upper part “II”, where the average was3.2; and the region of the smallest distribution was “VI” as in the case of teeth. The average length of the 1123 teeth was0.86mm. In the division of 0.50, 671 of them (59.8%) had a length ranging from 0.51 to1.00mm, with the maximum of 4.49 mm. The total 859 bays had the average width of1.28mm, with the maximum 3.67 mm. The results of the 0.50-division showed that 453 (52.7%) had a width ranging from 1.01to1.50mm.
