The morphological basis of folded-wing posture in the American Kesrel, Falco sparverius
Article first published online: 8 FEB 2005
Copyright © 1992 Wiley-Liss, Inc.
The Anatomical Record
Volume 232, Issue 4, pages 493–498, April 1992
How to Cite
Meyers, R. A. (1992), The morphological basis of folded-wing posture in the American Kesrel, Falco sparverius. Anat. Rec., 232: 493–498. doi: 10.1002/ar.1092320406
- Issue published online: 8 FEB 2005
- Article first published online: 8 FEB 2005
- Manuscript Accepted: 1 OCT 1991
- Manuscript Received: 12 AUG 1991
Gross dissection and histochemical analysis of the shoulder musculature of the American kestrel, Falco sparverius, revealed that four muscles are specialized for slow contraction and may function in the postural control of the folded wing. Mm. latissimus dorsi pars cranialis, scapulohumeralis cranialis, and brachialis were found to contain > 95% tonic fibers, whereas M. deltoideus minor was found to possess a relatively even mix of fast-twitch and tonic muscle fibers. M. latissimus dorsi pars cranialis, M. scapulohumeralis cranialis, and M. brachialis crosses the elbow joint on the ventral surface of the forearm. This paper suggests postural muscles have largely been ignored in studies of avian musculature, and the need to consider a variety of possible muscle functions when analyzing locomotor muscle functions.