Explain diseases of pericardium, Biology

Assignment Help:

Q. Explain Diseases of 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:- Explain diseases of pericardium

Define need of vitamin a during pregnancy period, Define Need of vitamin A ...

Define Need of vitamin A during pregnancy period? All four vitamins (A,C,E and K) have specific functions and a common role for all of them is to preserve the structural and fu

What are the centrioles, Q. Into which periods is mitosis has divided? ...

Q. Into which periods is mitosis has divided? Mitosis is divided into four periods: metaphase, prophase, telophase and anaphase. Q. What are the centrioles and in which typ

What is tagma, What is Tagma, Tagmosis and Tagmatization? Distinct body...

What is Tagma, Tagmosis and Tagmatization? Distinct body regions resulting when different segments of a metameric animal become involved in specific functions. These segments a

Water cycle or hydrological cycle, Water is an essential commodity for surv...

Water is an essential commodity for survival of life on these plants. The circulation of water and moisture between living organism, atmosphere and earth is called as water cycle

Monitoring of risk management, Monitoring of risk management Assessment...

Monitoring of risk management Assessment of effectiveness  of measures taken, and review risk  management  and/or assessment,  as  necessary. The outcome of the risk evaluation

What is the function of lymph nodes, Explain function of lymph nodes? L...

Explain function of lymph nodes? Lymph nodes have white blood cells which ingest bacteria and prevent them from reaching the circulation.

What is packaging, Q. What is packaging? What is packaging? Packaging...

Q. What is packaging? What is packaging? Packaging means a coordinated system of preparation of goods (in this case, foods) for shipment, distribution, storage and

How does photoperiodism affect the flowering of some plants, How does photo...

How does photoperiodism affect the flowering of some plants? The Flowering is an easy and typical to observe example of photoperiodism. Most of flowering plants flower only dur

Major groups into which the study of the plants is divided, Q. What are the...

Q. What are the four major groups into which the study of the plants is divided? In Botany the plant kingdom is divided into pteridophytes, bryophytes, angiosperms and gymnospe

Slow walking or crawling, Slow walking or Crawling This type of locom...

Slow walking or Crawling This type of locomotion is seen while the animal moves on the substratum. It involves a metachronal rhythm of action in the parapodia. Each fifth or

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