Rhamphotheca


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Rhamphotheca

 

the horny covering of a bird’s bill. The rhamphotheca forms the culmen on the upper jaw and the gonys on the lower jaw. It usually consists of one piece, but in cormorants, gannets, geese, skuas, and Procellariiformes it is made up of separate parts. The rhamphotheca may have various growths and teeth, and there is a cere in the proximal section of the rhamphotheca. Molting of the rhamphotheca usually involves the continual breaking and falling away of the horny layer; less frequently it falls off all at once, as in the seasonal molt of grouse.

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(13) The extent of the buildup of keratin on the rhamphotheca and the increased opacity in the sinuses of this toucan were apparent on radiographs and CT imaging because of the advanced nature of the disease process.
Five months before presentation, the owners noticed a mass on the rhamphotheca of the lower beak.
The horny lamellae, localized at the edges of the rhamphotheca and used in apprehension of food (28) were not affected by the positioning of the pins.