third eyelid
see membrana nictitans, nictitating membrane.
third eyelid eversion
the free margin of the third eyelid is rolled outwards because of a curvature of the cartilage. More prevalent in large breeds of dogs and may be an inherited defect in St. Bernards and German shorthaired pointers.
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Eversion of the third eyelid in a dog. By permission from McCurnin D, Poffenbarger EM, Small Animal Physical Diagnosis and Clinical Procedures, Saunders, 1991
third eyelid protrusion syndrome
see cherry eye.
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