Illustrated Encyclopedia of Human Anatomic Variation: Opus IV: Organ Systems
Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD
Peer Review Status: Internally Peer Reviewed
The eyelids may be absent. The margin of either lid is sometimes notched or fissured. The palpebral fissure may be wider or narrower than usual, or the lids may be united by vascularized tissue. The muscles of the lid occasionally fail to develop. Supernumerary eyelids may occur.
References
Anson, B.J., Ed. (1966) Morris' Human Anatomy, 12th ed. The Blakiston Division, McGraw-Hill Book Company, New York.
Ptasinska-Urbanska, M. (1965) Variation of the structure of the tarsal discs in man. Folia Morphol. (Warsaw) 24:273-279.
Wolff, E. (1954) The Anatomy of the Eye and Orbit, 4th Ed., Lewis, London.
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