spacer gif spacer gif spacer gif spacer gif spacer gif
QUICK SEARCH:   [advanced]


spacer gif
     Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents    

Right arrow Help viewing high resolution images
Right arrow Return to article

(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.



Fig. 1. Changes in the amount of esophageal inflation during a sequence of two coos. The enlargement of the esophagus (top graph) is produced by airflow through the syrinx in the expiratory direction while the beak and nares are closed. Complete beak closure, as seen in the x-ray video, is indicated by arrow 1. The amount of inflation was estimated by measuring the area of the esophagus (shaded area on the drawing of the dove) in the two-dimensional x-ray image. Maximum inflation occurs at the end of the coo (arrows 2 and 3). The esophagus does not completely collapse between bouts of cooing. Coos are shown spectrographically (middle panel) and as an oscillogram (bottom panel). i, inspiratory note; e1, first note of the coo; p, pause between first and second note; e2, second note of the coo.





Right arrow Return to article