What do you mean by pericardium, Biology

Assignment Help:

Q. What do you mean by Pericardium?

Pericardium is the sac covering the heart. Pericardium consists of two layers-the visceral pericardium (epicardium) and the parietal pericardium. The visceral pericardium directly lines the heart surface. The cavity between the two layers of the pericardium contains approximately 15 to 35 ml. of serous fluid-the pericardial fluid. The visceral pericardium is a thin membrane-a monolayer of mesothelial cells, while the parietal pericardial thickness may be up to 2.5 to 3.0 mm. Perietal pericardium is attached loosely by ligaments to sternum and vertebral bodies and firmly to central tendon of the diaphragm.

The phrenic nerves lie over the parietal pericardium and supply most of it. Vagal fibres from oesophageal plexus also supply pericardium. The internal mammary arteries and small branches from aorta supply the pericardium. The parietal pericardial lymphatics drain to the anterior and posterior mediastinal nodes while the visceral pericardial lymphatics drain to tracheal and bronchial mediastinal nodes. The pericardium buttress the thinner chambers of the heart, the atria and right ventricle and maintains the normal diastolic pressures and dimensions in these chambers. The pericardium can prevent acute cavitary dilatation. The pericardial fluid reduces the friction during heart movement. The ligamentous attachment of pericardium to the neighbouring structures prevent cardiac displacement. The normal intrapericardial pressure can vary from -5 to +5 mm. of Hg. though mostly it is negative. The pericardial pressure varies during respiration along with pleural pressure.


Related Discussions:- What do you mean by pericardium

Division phase or mitosis, DIVISION PHASE OR MITOSIS (M- PHASE) Cell di...

DIVISION PHASE OR MITOSIS (M- PHASE) Cell division was first  observed by  Naegeli 1842 in plant cells ,but  thoroughly described by Eduard strasburger  1875. Fleming 1879 desc

Chemical substances that compose the plasma membrane, What are the chemical...

What are the chemical substances that compose the plasma membrane? Ans) The major constituents of the plasma membrane are phospholipids, proteins and carbohydrates. The phosphol

What is sodium-potassium pump, Sodium-potassium pump A. The net flux of...

Sodium-potassium pump A. The net flux of sodium is from a region of high sodium concentration to a region of low sodium concentration. B. The net flux of potassium is from a

What is the plasma membrane of the cell, The plasma membrane is the outer m...

The plasma membrane is the outer membrane of the cell it delimits the cell itself and a cell interior with particular conditions for the cellular function. As it is selectively per

Acute myocardial infarction with haemodynamic deterioration, Acute Myocardi...

Acute Myocardial Infarction with Haemodynamic Deterioration :  These patients may require urgent insertion of intra aortic balloon pump (IABP) followed by PTCA or surgery. 50 per

Explain vanishing points., A vanishing point is where parallel lines that m...

A vanishing point is where parallel lines that move off into the distance seem to converge. It's an artifact of perspective. The vanishing point for any set of lines that are paral

Explain the concerns of genetically modified (gm) foods, Normal 0 ...

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

How to reduce calorie intake from fat, How to reduce calorie intake from fa...

How to reduce calorie intake from fat? Efforts should be made to increase the nutrition knowledge of the general public through mass media. The foods with lower fat co

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd