The present investigation was carried out under the supervision of the Animal Health and Ethics Committee of the Faculty of Veterinary Medicine, South Valley University and under Egyptian rule. The present study aimed to provide a wide range of details morphological analysis of laryngeal mound of cattle egret from various perspectives, especially gross anatomy, light microscopic examination, in addition to scanning electron microscopy. Very few morphological studies were performed on the laryngeal mound of cattle egret and none describing it microscopically or scanning electron microscopically (SEM). We compared the nasal cavity of the aquatic and non-aquatic birds. The laryngeal mound performs both respiratory and digestive functions so a variety of scholars have studied the anatomy of the laryngeal mound in various avian species such as Egyptian geese, turkey, guinea fowl, Long-Legged Buzzard and other birds. The morphology and physiology of avian respiratory system differed distinctly from those of mammals. It sometimes accompany cattle or other large animals, capturing insects and small vertebrates, which are disturbed by these creatures, in addition to feeding on earthworms, lizards, crickets and flies in the earth. It is a white bird decorated with buff feather during breeding season and has a sharply pointed yellow short beak. In Egypt, usually inhabitant in the Nile Valley and Delta, nesting colonially in farms and wetlands on bushes with near water bodies. His Arabic name, Abu quirdan means “father of ticks”, a name emanated from the abundance of bird ticks grow in her spawning colonies. The cattle egret (Bubulcus ibis, Linnaeus, 1758), the multinational heron species (Family: Ardeidae, Order: Ciconiiforms) disperses in warm climates where its distribution is rapidly expanding. The laryngeal mound shows certain features that are unique as an adaptation to lifestyles and bird’s habitat. The glandular epithelium of the laryngeal salivary glands and chondrocytes of the laryngeal cartilages showed strongly positive alcian blue reaction. Two groups of intrinsic laryngeal skeletal muscles have connected the cartilages. The glottis within the laryngeal mound was supported by hyaline cartilages dorsally by paired arytenoid cartilages, ventrolaterally by cricoid cartilage, and caudodorsally by procricoid cartilage. Those glands were surrounded by abundant aggregation of lymphocytes, extended overlying the surface lining epithelium. Histologically, laryngeal salivary glands termed (cricoarytenoid salivary glands) of the laryngeal mound were simple tubular type and were arranged in one row within the lamina propria connective tissue close to the lamina epithelialis. Furthermore, the terminal part of the laryngeal mound (except the middle part) was bordered a transverse row of pyramidal-shaped papillae, which demarcated from the esophagus. By SEM view, the lateral aspect of the caudal third of the laryngeal mound had a serrated mucosal appearance, forming of 6–7 finger-like projections. It represented 20.55 and 67.87% of the total length of the oropharyngeal floor and the pharyngeal floor, respectively. The laryngeal mound ( Mons laryngealis) was a pear-shaped musculoskeletal elevation. Heads of ten healthy adult male Egyptian cattle egrets were used in this study. This study was obtained with the aid of scanning electron microscopy (SEM) and histological techniques. According to our acknowledgment this is the first full anatomical description of the studied laryngeal mound of the Egyptian Cattle Egret (Bubulcus ibis, Linnaeus, 1758).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |