2. Pericardium
• Definition: The pericardium is a fibroserous sac
that encloses the heart and the roots of the great
blood vessels.
• Site: The pericardium lies within the middle
mediastinum, posterior to the body of the sternum
and the second to the sixth costal cartilages and
anterior to the fifth to the eighth thoracic vertebrae
• Functions:
• Restrict excessive movements of the heart as a
whole
• Serve as a lubricated container in which the
different parts of the heart can contract.
3.
4. Divisions of the pericardium
The pericardium divided into:
1. Fibrous Pericardium
2. Serous Pericardium
5.
6. Fibrous Pericardium
• The fibrous pericardium is the strong fibrous
part of the sac.
• The fibrous pericardium is attached in front to
the sternum by the sternopericardial
ligaments. It is firmly attached below to the
central tendon of the diaphragm.
• It fuses with the outer coats of the great blood
vessels passing through it, (the aorta, the
pulmonary trunk, the superior and inferior
venae cavae, and the pulmonary veins).
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8.
9. Serous Pericardium
• The serous pericardium lines the fibrous
pericardium and coats the heart.
• It is divided into parietal and visceral layers.
• The parietal layer lines the fibrous pericardium
and is reflected around the roots of the great
vessels to become continuous with the visceral
layer of serous pericardium that closely covers
the heart
• The visceral layer is closely applied to the
heart and is often called the epicardium.
10.
11. pericardial cavity
• the pericardial cavity is a slitlike space
between the parietal and visceral
layers
• Normally, the cavity contains a small
amount of tissue fluid (about 50 mL),
the pericardial fluid, which acts as a
lubricant to facilitate movements of
the heart
12.
13.
14. Pericardial Sinuses
• There are 2 sinuses of pericardium;
• The oblique sinus
• The transverse sinus
• These pericardial sinuses form during
development of the heart as a
consequence of folding of the primordial
heart tube. They have no clinical
significance.
15.
16.
17. 1
.
The oblique sinus
• Site: on the posterior surface of the heart,
lies behind the left atrium.
• It is a blind recess formed by the
reflection of the serous pericardium
around the large veins (left pulmonary
veins and the inferior vena cava).
18.
19. 2
.
The transverse sinus
• Site: on the posterior surface of the
heart
• which is a short, wide passage lying
posterior to the ascending aorta and
pulmonary trunk, anterior to the
superior vena cava, and superior to
the left atrium and the pulmonary
veins
20.
21.
22.
23. Nerve Supply of the Pericardium
• The fibrous pericardium and the
parietal layer of the serous
pericardium are supplied by the
phrenic nerves.
• The visceral layer of the serous
pericardium is innervated by branches
of the sympathetic trunks and the
vagus nerves
