ANATOMICAL AND TOPOGRAPHIC DESCRIPTION OF THE AIR BAGS OF MALLARD, Anas platyrhynchos (Aves: Anseriformes)

作者：de Araujo Juliana Morgado^*; Kfoury Junior Jose Roberto; Faria da Cunha Bianchi Pedro Kastein; Guimaraes Gregorio Correa; Goncalez Patricia Orlandini

来源：Bioscience Journal, 2014, 30(3): 810-815.

• Anas platyrhynchos
• Anatomy
• Respiratory system

The respiratory system of birds is very effective, comprised by small and compact lungs associated with air sacs that differ between species regarding their topography. Considering this latter aspect, this work aimed to perform an anatomical and topographical description of the air sacs in mallard (Anas platyrhynchos). Ten mallards, five males and five females, had theirpost-cephalic respiratory tract injected with colored latex and fixed by a 10% formaldehyde solution. The presence of cervical, clavicular, cranial thoracic, caudal thoracic and abdominal air sacs was observed. The cervical air sac was distributed in both antimeres situated dorso-laterally to the muscles of the neck. The clavicular air sac presented an irregular distribution, showing a middle and two lateral parts with numerous projections between the cervical and cranial thoracic organs and presenting several diverticula to the coracoids, sternum and humerus bones. Its middle portion formed, in some cases, a projection around the heart. The cranial thoracic air sacs were found caudal to the heart, medially to the first four ribs, being overplayed by the liver. The caudal thoracic air sacs were located in a middle position to the cranial thoracic and abdominal air sacs extending beyond the edge of the rib, over the cranial portion of the abdominal air sac. The abdominal air sacs were found caudal-medial to the caudal thoracic air sacs and lateral to the digestive tract. The thoracic and abdominal air sacs presented few projections between the organs, has and showed regular margins and a high volumetric capacity.

• 出版日期2014-6