Pericardium

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Assistant Editor(s)-in-Chief: Rim Halaby

Overview

The pericardium is a double-walled sac that contains the heart and the roots of the great vessels. Morphologically, it is a conical-shaped, double-walled fibro-serous membrane. It rests posteriorly to the sternum at the level of second to sixth costal cartilages and T5-T8 vertebrae.

Layers

  • The pericardium is made up of two layers:
    • Fibrous pericardium
      • Hard protective external layer
      • Attached to sternum anteriorly by sterno-pericardial ligaments and fused with the central tendon of the diaphragm and great vessels to allow mobility of the pericardial sac against sudden cardiac overfilling
    • Serous pericardium
      • Smooth internal layer made up of 2 components:
        • Parietal: reflects onto fibrous pericardium
        • Visceral: reflects onto heart and great vessels and forms the epicardium, the external layer of the heart wall
  • Pericardial cavity: Potential space between parietal and visceral layers. It contains a serous fluid film that occupies the cavity and functions as lubricant against friction by all chest movements.[1][2][3]

Pericardial Sinuses

  • There are two small chambers or sinuses located where the visceral and parietal pericardia are continuous with one another within the pericardial cavity.
  • Transverse sinus:
    • Located posterior to the pulmonary trunk and ascending aorta at the level between the superior vena cava and aortic arch
    • Formed after dorsal mesocardium rupture embryonically
    • Functional role is to allow the unhindered expansion of great arteries posteriorly during cardiac systole
    • Utilized surgically to pass surgical clamps or place ligatures around great arteries.
  • Oblique sinus:

Diseases of the Pericardium

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References

  1. Kishore, K. (2003). The Heart of Structural Development: The Functional Basis of the Location and Morphology of the Human Vascular Pump. J Postgrad Med, 49:282-4.
  2. Moore, K. L., Agur, A. M., & Dalley, A. F. (2011). Essential Clinical Anatomy - Fourth Edition. Lippincott Williams & Wilkins.
  3. Tank, P. W. (2009). Grant's Dissector - Fourteenth Edition. Lippincott Williams & Wilkins.
  4. Kishore, K. (2003). The Heart of Structural Development: The Functional Basis of the Location and Morphology of the Human Vascular Pump. J Postgrad Med, 49:282-4.
  5. Moore, K. L., Agur, A. M., & Dalley, A. F. (2011). Essential Clinical Anatomy - Fourth Edition. Lippincott Williams & Wilkins.
  6. Tank, P. W. (2009). Grant's Dissector - Fourteenth Edition. Lippincott Williams & Wilkins.

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