Sexual Dimorphism in the Anatomical Features of the Syrinx in the White Pekin Ducks (Anas platyrhynchos)

The main purpose of this study to investigate the position and normal anatomical features of the syrinx in adult male and female white pekin ducks. Eight (5 females and 3 males) adult white pekins ducks weighting 1500-2000 gram were examined. Anatomical examination revealed the syrinx was located in the thoracic cavity at the bifurcation of the trachea. The syrinx was tracheobronchial type formed by syringeal cartilages, pessulus, tympaniform membranes, interbronchial ligament and foramen as well as and extrinsic muscles of the syrinx. The syrinx was a symmetrical in the male forming bulla tympaniformis but in the female duck had no tympanic bulla.