Relation betweeen structure and function of tongue in larus relictus
Author of the article:LIU Li1, ZHANG Le1, SUN Yan1, MIAO Chunlin2, ZHANG
Author's Workplace：(1. Faculty of Biological Science and Technology, Botou Teachers’ College, Baotou, Inner Mongolia Autonomous Region 014030, China;
Key Words：habitat; relict gull (Larus relictus); tongue; ultrastructure
Abstract：We observed the structure of the tongue of Larus relictus using light and scanning electron microscopy. The tongue of L. relictus is triangular in shape, and comprises three different parts: the lingual apex, lingual body, and lingual root. The tongue fork has keratinized processes at the lingual apex; the lingual apex has a large number of epithelial cells, and the cell surfaces appear to form a fingerprint. The surface of the lingual body is smooth, and the epithelial cells are elongated with cell surface microridges. The surface of the lingual root has a small number of salivary gland openings. These results indicate that the structure of the tongue of L. relictus is adapted to collecting food. In another, the papillae on the lingual mucosa were not perfectly developed and had a cone-shaped appearance, with a row-like distribution on the maxillary surface and at the boundary between the body and root, and the papillae ends pointed toward the intra-oral cavity. Taste buds in the lingual mucosa were also underdeveloped. Obvious differences exist in the characteristics of the oral structure between L. relictus and other members of the Laridae family, which may be related to habitat deterioration, changes in food type, or food scarcity.