[Variations in the muscular insertion, the course and elasticity of the muscles in people suffering from squint (author's transl)].

Variations in the area of the insertions of the rectus muscles are quite often observed. We have been paying more attention to these changes during the past year, and therefore we measured the distance of insertion from the corneal limbus during 310 squint operations. Furthermore we noted the width of the tendon at the insertion, atypical forms of insertions and finally we tried to evaluate the factor of muscular elasticity. The findings are as follows: 1. The arithmetical mean of the distance of insertion from the limbus was slightly less than cited in literature on this subject. It was not unusual to find variations of up to 4mm, even between the same muscles of both eyes. This seems to have little influence on the primary position and on the success of surgical interventions; when they do not exceed the measures cited in our paper. The relatively great area of contact will balance these variations. 2. We could not find a correlation between anomalies of refraction and the distance of insertions of the limbus. The insertions of higher degree hyperopia was not closer to the limbus. 3. The arithmetical mean of the width of tendon conformed to the values as shown in the literature. A range up to 8 mm for the medial rectus, up to 5,5 mm for the lateral rectus and up to 2,5 mm for the vertical rectus were observed. 4. We could see variations of the insertions: upward and downward and furthermore different lines of insertions: arched and step-like. These anomalies were found 52 times among the 310 muscles measured. 5. An increased muscular rigidity was felt in 56 medial rectus and in 13 lateral rectus muscels. In 21 cases the course of the horizontal muscles was atypical, i.e., they ran from below diagonally out of the orbita.