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Morphology of the distal parts of the bird wing

Morphology of the distal parts of the bird wing

Zool Zh 44(3): 423-432

The first segment of the 2nd digit on the wing skeleton of some bird species has a more or less highly developed process (processus internus indicis) at the distal ulnar margin. This is not present at all in other species. This process serves as a guide for the ligament of the m. interosseus palmaris which adducts the 2nd segment of the 2nd digit (retracts it in the plane of the wing). The presence of a process makes for greater efficiency in the tractive force of the m. interosseus palmaris. This is important with heavy drag on the distal primaries. Therefore, the processus internus indicis is most highly developed in birds with long, pointed wings, particularly in forms which fly rapidly and actively.

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Accession: 025038710

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