Furcula


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furcula

[′fər·kyə·lə]
(zoology)
A forked structure, especially the wishbone of fowl.

Furcula

 

or wishbone, an arc-shaped bone of the shoulder girdle of birds, formed by the connate clavicles.

The furcula may be connected to the sternum, while its upper ends are connected with the scapulae and coracoid bones. The furcula gives the shoulder girdle elasticity. This structure has existed since the time of the archeopteryx. It is well developed in birds that fly easily and less so in those that fly poorly. In some parrots and owls the furcula is not connate, but both its branches are connected by a fibrous ligament. In flightless ratite birds the furcula is rudimentary, and the clavicles are either not joined or absent altogether, as in the kiwi or the extinct moa.

References in periodicals archive ?
IV, head, coxa, trochanter, femur, body and anterior and posterior face of furcula (manubrium and dens).
Cuerpo alargado nunca globoso, segmentos del torax y primeros cuatro segmentos abdominales no fusionados; furcula presente de tamano variado (Figs.
Furcula represented by two, digitiform, robust projections as long as broad, with rounded apex.
The furcula is represented by short, subtriangular, rounded lobes and the male supra-anal plate is subtriangular.
Measurement data (tegmen length, distance between eyes, and male furcula length) were analyzed under a normal distribution while categorical variables (tibial color, postocular bar development, and postocular color) were analyzed under a multinomial distribution.
3B); male cerci lateral view subconical, basally expanded, acutely incurved about middle portion, diStal half spatulate (Figs 3C, D); furcula with rounded lobes projecting finger-like downwards (Fig.
4)Tenth abdominal tergite decorated with 5 melanized points, but no furcula per se.
Male: Posterior margin of 10th tergite usually with the suspicion of a small weak furcula (e.