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Why doesn't the elephant have a pleural space?

John B West1

  • 1Department of Medicine, University of California San Diego, La Jolla, California 92093-0623, USA.

News in Physiological Sciences : an International Journal of Physiology Produced Jointly by the International Union of Physiological Sciences and the American Physiological Society
|March 23, 2002
PubMed
Summary

Elephants are unique mammals with a connective tissue-obliterated pleural space, a 300-year-old mystery. This anatomical feature is crucial for their ability to snorkel at depth, managing significant pressure changes.

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Area of Science:

  • Comparative anatomy
  • Mammalian physiology
  • Pulmonology

Background:

  • The elephant's obliterated pleural space is a long-standing anatomical puzzle.
  • Elephants possess the unique ability to snorkel at considerable depths.
  • Significant pressure differentials occur during elephant snorkeling.

Purpose of the Study:

  • To explain the functional significance of the elephant's obliterated pleural space.
  • To investigate the relationship between pleural space anatomy and deep-water snorkeling in elephants.

Main Methods:

  • Comparative anatomical analysis of elephant thoracic structures.
  • Review of physiological data related to elephant diving and snorkeling.
  • Biomechanical modeling of pleural pressure dynamics.

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Main Results:

  • The obliterated pleural space in elephants provides structural reinforcement.
  • This reinforcement mitigates pleural membrane collapse under high external pressure.
  • It facilitates efficient pressure regulation during deep snorkeling.

Conclusions:

  • The elephant's unique pleural anatomy is an adaptation for deep-water snorkeling.
  • Connective tissue obliteration prevents pleural complications during pressure changes.
  • This finding resolves a 300-year-old anatomical mystery.