By Erna E. Kritzinger
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Extra resources for A Colour Atlas of Optic Disc Abnormalities
0 7-5 5-5 Pinnipedia Hooded Seal Grey Seal THE OBLIQUES IN CARNIVORA The obliques in carnivora are without exception attached in front of the equator and therefore act as accessory adductors. This latter rôle is accentuated by the fact that, as a rule, the obliques in carnivora are split at their insertion. In the cat-like carnivora examined, both superior and inferior obliques were split, the only exceptions found being in the Pampas, Geoffroy and a hybrid jungle cat, in whom only the inferior oblique was split.
Pars plana 1 -3 mm. 4-5 mm. 48 PRINCIPLES OF OPHTHALMOLOGY T h e disposition of the ciliary muscle is as follows : Superior quadrant Ciliary muscle 2-2 mm. Nasal quadrant Ciliary muscle 1-5 mm. Overlapped by retina ί \ (1 4) \ J \^_L^/ Temporal quadrant Ciliary muscle 2-4 mm. Inferior quadrant Ciliary muscle 2-0 mm. Overlapped by retina T H E CILIARY REGION I N BATS A N D RODENTS T h e ciliary region in these orders is small in proportion to the globe. It is not more than 2 m m . wide in the rabbit and the hare, providing them with their proverbially wide fields of vision.
This advanced position of the retina on the nasal side implements the divergent optical axis in extending the outer field of vision. 34 PRINCIPLES OF OPHTHALMOLOGY (9) In bats and rodents the width of the ciliary circum ference is reduced to a minimum by the ciliary processes arising from the back of the iris as in the opossum (Plate I I ) . The widest possible field of vision is thereby obtained. (10) Man is the only mammal in whom the ciliary region above is smaller than that below. This is in conformity with the physiological field of vision.
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