Pekten okuli
Pekten okuli adalah struktur pembuluh darah koroid di mata seekor burung yang berbentuk seperti sisir. Ini bukanlah indra dan merupakan struktur berpigmen yang terhubung ke vitreous humor dari titik di mana saraf optik memasuki bola mata.[1] Pekten okuli ini diyakini berperan memelihara retina dan mengontrol pH vitreous humor.[2] Pekten okuli terdapat di semua burung dan beberapa reptil.[3]
Pada mata vertebrata, pembuluh darah terletak di depan retina, sebagian menutupi gambar. Pekten okuli ini membantu untuk memecahkan masalah ini, mengangkat pembuluh darah dari retina sehingga penglihatan menjadi sangat tajam burung seperti elang.[4] Adanya pigmen dalam pekten okuli diyakini melindungi pembuluh darah terhadap kerusakan dari sinar ultraviolet.[5]
Referensi
- ^ Walls (1942), The Vertebrate Eye and its Adaptive Radiation, Hafner, ISBN 0-02-854430-7
- ^ Kiama, S G.;J. N. Maina;J. Bhattacharjee and K. D. Weyrauch (2001) Functional morphology of the pecten oculi in the nocturnal spotted eagle owl (Bubo bubo africanus), and the diurnal black kite (Milvus migrans) and domestic fowl (Gallus gallus var. domesticus): a comparative study. Journal of Zoology 254: 521-528
- ^ Bonney, Rick; Rohrbaugh, Jr., Ronald (2004), Handbook of Bird Biology (Edisi Second), Princeton, NJ: Princeton University Press, ISBN 0-938027-62-X
- ^ "Evolution's greatest mistakes", New Scientist, August 11, 2007
- ^ S G Kiama, J Bhattacharjee, J N Maina, and K D Weyrauch (December 1994), "A scanning electron microscope study of the pecten oculi of the black kite (Milvus migrans): possible involvement of melanosomes in protecting the pecten against damage by ultraviolet light", Journal of Anatomy, 185 (Pt 3): 637–642, PMC 1166670, PMID 7649799 Pemeliharaan CS1: Banyak nama: authors list (link)
Pranala luar
- Electron microscopy photos of the pecten in the black kite (Milvus migrans)
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