Working Model of the Extrinsic Eye Muscles.
نویسنده
چکیده
IT is not easy for beginners to understand the actions of the extrinsic ocular muscles by simple reference to the geometry of their arrangement and attachments. A working model has been designed which has been found useful for demonstrating these actions, both singly and in groups. The requirements of a satisfactory model are that it should be large enough for movements to be easily seen and that these movements should be reasonably full and accurate. For construction of the globe, the 3-in. diameter hardwood ball sold for the game of shinty was found to be of suitable size and quality. The hardwood base for the model was then made 71 in. long to represent the correct proportion of globe to orbital floor. Full movement of the ball was assured by using a thrust bearing consisting of a 2-in. diameter shallow brass cup and nylon washer, with a brass flange soldered to the inner aspect of the cup to prevent dislocation of the globe which otherwise occurs. The bearing was fixed to a rod bent through 900 and attached to the back of the upper surface of the base. This rod was also used to bear a ring at its posterior end for the attachment of the rubber bands representing the rectus muscles (Figs 1 and 2).
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ورودعنوان ژورنال:
- The British journal of ophthalmology
دوره 49 شماره
صفحات -
تاریخ انتشار 1965