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Studies have found that nasal problems plague relatives of long-nosed crocodiles.

A bird’s-eye view of the Louise septum that may have caused the animal to have nosebleeds by creating high shear stress along the nasal wall. Credits: Jason Bourke, Ph.D.

Studies published in the journal Anatomical record We have found that humans have more in common with endangered crocodiles than we think. In other words, it is a nasal septum deviation.


Gharials are some of the rarest crocodiles on the planet and are members of a group of animals that once roamed the planet with dinosaurs. Native to India, Gharials are similar to American alligators and crocodiles, but have bulging eyes and a very long, thin nose that can cut through the water when hunting for prey. For men, this nose has an even longer nose, which ends with an enlarged bulb.

At first glance, these rare animals seem to have little in common with humans. However, a new study led by Dr. Jason Burke, an assistant professor of basic science at Arkansas State University Osteopathic Medical College (NYITCOM-Arkansas), reports that he suffers from nasal septum deviation, just like humans.

Cleveland Clinic estimates that up to 80% of people deviate Septam, The nasal cartilage is “off center”. Most people have a mild condition, but large deviations limit nasal breathing and Reconstructive surgery..

Burke and his colleagues first recorded a crocodile septal deviation. They used medical imaging techniques to analyze the heads of multiple gharial specimens, including the head of a large female at Fort Worth Zoo called “Louis,” which stimulated curiosity.

“This strange septum was an unexpected discovery,” said Dr. Casey Holiday, co-author of the study and associate professor of pathology and anatomy at the University of Missouri. “I saw this septal roller coaster and wondered what this meant for breathing.”

Holliday shared Louise’s extreme anatomy with Bourke, a vertebrate paleontologist who specializes in modeling. Fluid mechanics To the nose of animals using sophisticated computer software that simulates the movement of air.

A NYITCOM study found that nose problems were plagued by relatives of long-nosed crocodiles.

Gharial “Louis” shown in multiple axial cross sections to account for the degree of nasal septum deviation witnessed in animals. Credits: Jason Bourke, Ph.D.

“We know very little about the anatomy of normal Gharial and little about pathology. I couldn’t miss such a unique opportunity,” said Burke, who also studied. rice field. Dinosaur nose airflow and thermoregulation..

Intrigued, Burke and his team began collecting samples from other Gharial specimens housed in zoos across the country. Some specimens showed slight septal deviations, but Louise was the most extreme case.

Like a human experiencing a severe septum deviation, Louise had to work harder to achieve the same breathing rate as her companion. This may have created a high shear stress along the nasal wall, making it easier for the animal to have nosebleeds. Despite the physiological challenges that result from this nasal pathology, Louise succeeded in adulthood and lived to the age of 50.

“This is a testament to the resilience of the crocodile,” Burke said. “A person with this condition will need surgery to fix it, but these creatures just continue.”

In contrast to humans, researchers have discovered that the gharial septal curve has a unique twist. “When the septum deviates in humans, part or all of the septum bends into one of the airways,” said Nicole Fontenot, a fourth-year student at NYITCOM and co-author of the study. “In our Gharial, the septum is so long that it sways back and forth along the nose, creating a wavy pattern.”

This condition is not found in other modern crocodiles, but long ago many other animals showed similarly elongated noses. Parasaurolophus A reptile that imitates a strange crocodile known as Champsosaurus. Burke suspects that at least some of them would have also suffered from a septal deviation. Burke explains why other crocodiles don’t seem to be prone to these deviant noses:

“Other crocodiles have a wider nose and a much thicker nasal septum. Thinning the nose makes space inside the nose important. Galial’s long, very thin nasal septum begins to wobble. You won’t need that much.

Researchers then continue their research by examining Gharial’s unique ability to make nasal sounds.


A review comparing commercially available nasal dilators


For more information:
Jason M. Bourke et al, Longest-faced crocodile nose septal curve: Gavialis gangeticus nose anatomy and airflow description and acoustic comments, Anatomical record (2021). DOI: 10.1002 / ar.24831

Quote: According to a survey, a relative of a long-nosed crocodile suffering from nasal problems (December 3, 2021) is https: //phys.org/news/2021-12-nasal-problem-plagued-long. Obtained from -nosed-crocodile.html on December 3, 2021.

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Studies have found that nasal problems plague relatives of long-nosed crocodiles.

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