动物实验 z-bo 2020-09-26 395

　　Researchers believe that Naruharu's canine teeth can help find differences in the surrounding sea water environment and differences in sea salt concentration, and help find companions. According to the "British Daily Mail" report, the Arctic Naruwal is known as the "sea unicorn" and "sea warrior", but the spiral teeth protruding from the head of Naruharu puzzled researchers. According to the latest research, this kind of tooth is actually a "detector".

　　Previously, researchers discovered that male Naruhar’s canines found differences in marine environments, such as salt in seawater, which helped this marine mammal (mammal; mammal) eat through cold water. I believe I can find and find friends. Long teeth can grow up to 2.6 meters. According to Martinweeia, the research director of the Department of Dentistry at Harvard University, the canine teeth of narwhals are actually like special sensitive teeth. The outer layer of the long teeth has grooves that allow seawater to enter the teeth, which can be connected to the teeth of the internal tissues, and also contain a small tube.

　　These small tubes reach the deepest part of Naruhar’s canine teeth, which are filled with blood vessels and nerve tissue directly connected to Naruvar’s brain. In this study, narwhals were captured and tagged. The researchers pointed out that the latest evidence shows that this unique dentin tubule is connected to the channel used to detect the marine environment through porous cement. The latest research report has been published in the journal Anatomy Records. The gene expression of neurons in the dental pulp and the sensory nerve tissue of the dental pulp is detected by immunohistochemistry, and the dental pulp tissue can feel external stimulation. Researchers believe that Naruhor's canine teeth help change sensory abilities in the environment and help find female partners and food. The newly discovered stable isotopes and differences in sexual foraging in the fatty acid record further strengthen the discussion of the importance of the Naruhar canine tooth function. These comprehensive evidences show that multifunctional canines can promote the development of the dental system.

　　At the same time, the researchers observed that Naruharu's canines were exposed to different salt water, and the corresponding Naruharu's heart rate also changed. The outer surface of aruharu canine teeth is exposed to alternating high salt and fresh water, and the heart rate changes significantly. , Finally confirmed the unique sensory ability of teeth.