This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in

Pleural cavities

Authoring team

The pleural cavities are the two potential spaces on each side of the thorax which are lined by visceral pleura on the inside and parietal pleura on the outside. The cavity normally has a very small volume that is largely made up by serous fluid secreted by the pleura. The fluid acts as a lubricant between visceral and parietal layers. Also, it is normally at negative pressure and this acts as the intermediate by which changes in thoracic volume - mediated by excursions of the thoracic cage and diaphragm - force changes in lung volume during respiration; increased thoracic volume decreases the fluid pressure in the closed pleural cavity and this draws the visceral pleura outwards by virtue of increased surface tension.

During a deep inspiration, the lungs expand by the above mechanism to fill the entire pleural cavity. However, at rest there are certain areas within the cavities where the visceral pleura is relatively distant to parietal pleura; these are the pleural recesses.

As a potential space, the pleural cavity may be:

  • expanded by:
    • reducing lung volume e.g. hypoplastic lungs
    • increasing pressure within the cavity e.g. by space occupying lesions such as blood - haemothorax - or air - pneumothorax
  • reduced in size by:
    • pathological adhesions between the pleura
    • therapeutic/diagnostic use of thoracocentesis or 'chest drainage'
    • therapeutic surgical pleurectomy
    • therapeutic pleural poudage

Related pages

Create an account to add page annotations

Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.

The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

Connect

Copyright 2024 Oxbridge Solutions Limited, a subsidiary of OmniaMed Communications Limited. All rights reserved. Any distribution or duplication of the information contained herein is strictly prohibited. Oxbridge Solutions receives funding from advertising but maintains editorial independence.