According to the British Daily Post report, the Arctic narwhal is known as the "Ocean Unicorn" and "Marine Warrior," but the spiraling teeth protruding from the narwhal head have puzzled scientists. Currently, the latest Studies have shown that this long tooth is actually a "detector." Previously, scientists believed that the male narwhal tusks could detect differences in the marine environment, such as sea salt, helping the marine mammal to navigate in icy seawater, foraging or searching for a spouse. Teeth can grow to 2.6 meters. According to Martin Nweeia, head of research at Harvard Medical School of Dentistry, the fact is that narwhals are like a special sensitive tooth. The outer teeth of the tusks are distributed with grooves that allow seawater to enter the teeth. The outer part can be connected to the internal tissue, the dentin, and it also contains small tubes. These small tubes reach the deepest part of the narwhal ivory, which is filled with blood vessels and nerve tissue. The blood vessels are directly connected to the narwhal brain. In the study, narwhal was captured and tagged. The researchers pointed out that the latest evidence shows that this unique dentinal tubule is connected to a channel to perceive the marine environment through porous cementum detection. The latest research report was published in the journal Anatomy. Through the immunohistochemical detection of neurons in the dental pulp and the gene expression of dental pulp sensory nerve tissue, the dental pulp tissue can sense external stimuli. Scientists believe that narwhal tusks help them change their senses in the environment and have an advantage in finding female spouses and food. Stable isotopes and fatty acids recording the newly discovered differences in sexual foraging further enhance the functional significance of narwhal teeth, and this combined evidence suggests that multifunctional long teeth may drive the evolution and development of dental organ systems. At the same time, the researchers observed that exposure of narwhal tusks to different salty seawater and corresponding changes in the narration heart rate, alternate exposure of the outer surface of narwhal tusks to high salt and fresh water, through the discovery of significant changes in heart rate, eventually The unique sensory abilities of teeth are confirmed. (Source: Tencent Scientific News/Compilation)
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