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Encyclopedia > Myocardium

Myocardium is the muscular tissue of the heart. A top-down view of skeletal muscle Muscle (from Latin musculus little mouse [1]) is contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. ... The heart and lungs, from an older edition of Grays Anatomy. ...

Contents

Relationship to other layers

The other tissues of the heart are:

In the heart, the endocardium is the innermost layer of tissue that lines the chambers of the heart. ... The endothelium is the layer of thin, flat cells that lines the interior surface of blood vessels, forming an interface between circulating blood in the lumen and the rest of the vessel wall. ... Epicardium describes the outer layer of heart tissue (from Greek; epi- outer, cardium heart). ... Connective tissue is one of the four types of tissue in traditional classifications (the others being epithelial, muscle, and nervous tissue. ... The pericardium is a double-walled sac that contains the heart and the roots of the great vessels. ...

Composition

The myocardium is composed of specialized cardiac muscle cells with an ability not possessed by muscle tissue elsewhere in the body. Cardiac muscle, like other muscles, can contract, but it can also conduct electricity, like nerves. Cardiac muscle is a type of involuntary mononucleated, or uninucleated, striated muscle found exclusively within the heart. ... A top-down view of skeletal muscle A muscle contraction (also known as a muscle twitch or simply twitch) occurs when a muscle cell (called a muscle fiber) lengthens or shortens. ... Electrical conduction is the movement of electrically charged particles through a transmission medium (electrical conductor). ... Nerves (yellow) Nerves redirects here. ...


The blood supply of the myocardium is by the coronary arteries. The coronary circulation consists of the blood vessels that supply blood to, and remove blood from, the heart. ...


Pathology

Occlusion of the coronary arteries by atherosclerosis and/or thrombosis can lead to myocardial infarction. Thrombosis is the formation of a clot or thrombus inside a blood vessel, obstructing the flow of blood through the circulatory system. ... Acute myocardial infarction (AMI or MI), commonly known as a heart attack, is a disease state that occurs when the blood supply to a part of the heart is interrupted. ...


Certain viruses lead to inflammation of the myocardium, or myocarditis. An abscess on the skin, showing the redness and swelling characteristic of inflammation. ... In medicine (cardiology), myocarditis is inflammation of the myocardium, the muscular part of the heart. ...


Cardiomyopathies are inherent diseases of the myocardium, many of which are caused by genetic mutations.


Failure of the heart to contract properly (for various reasons) is often termed heart failure although the proper term for this condition is myocardial failure. Heart failure is a general term referring to overwhelming heart disease from many causes (e.g., myocardial failure, valvular heart disease, increased ventricular stiffness) resulting in the inability of the heart to maintain normal ventricular filling pressure (resulting in fluid retention, edema, pulmonary oedema, hepatomegaly) and/or reduced blood flow to the body either at rest or during exercise. Myocardial failure resulting in heart failure results in a shortened life expectancy and decreased quality of life. Edema (American English) or oedema (British English), formerly known as dropsy or hydropsy, is swelling of any organ or tissue due to accumulation of excess lymph fluid, without an increase of the number of cells in the affected tissue. ... Hepatomegaly is the condition of having an enlarged liver. ... World map of human life expectancy, 2005 Life expectancy is a statistical measure of the average length of survival of a living thing. ... The well-being or quality of life of a population is an important concern in economics and political science. ...


Heart Disease Affecting Myocardium Tissue

Noncompaction Cardiomyopathy, is when the Myocardium tissue fails to compact as the human embryo develops. Non-compaction cardiomyopathy (NCC) is a rare congenital cardiomyopathy that affects both children and adults. ...


External links

abcdef sfdsfdkdsf ksfdkskfdj ksdkskjfdfgdkfg dgdf Myoblasts are a type of stem cells that exist in muscles. ... Satellite cells are mononuclear progenitor cells found in mature muscle between the basal lamina and sarcolemma. ... The Sarcoplasm of a muscle fiber is comparable to the cytoplasm of other cells, but it houses unusually large amounts of glycosomes (granules of stored glycogen) and significant amounts of myoglobin, an oxygen binding protein. ... The name sarcolemma is used to describe the cell membrane of a muscle fibre or muscle cell. ... The endoplasmic reticulum or ER is an organelle found in all eukaryotic cells that is an interconnected network of tubules, vesicles and cisternae that is responsible for several specialized functions: Protein translation, folding, and transport of proteins to be used in the cell membrane (e. ... A T-tubule (or Transverse tubule), is a deep invagination of the plasma membrane found in skeletal and cardiac muscle cells. ... Cardiac muscle is a type of involuntary mononucleated, or uninucleated, striated muscle found exclusively within the heart. ... An intercalated disc is an undulating double membrane separating adjacent cells in cardiac muscle fibers. ... Cultured Smooth muscle of the aorta. ... oommen sir is a fool. ... Vascular smooth muscle refers to the particular type of smooth muscle found within, and composing the majority of the wall of blood vessels. ...


  Results from FactBites:
 
Reference.com/Encyclopedia/Myocardium (403 words)
Myocardium is the muscular tissue of the heart.
The myocardium is composed of specialized cardiac muscle cells with an ability not possessed by muscle tissue elsewhere in the body.
Cardiomyopathies are inherent diseases of the myocardium, many of which are caused by genetic mutations.
Non-compaction of the Left Ventricular Myocardium - From Clinical Obser vation to the Discovery of a New Disease (984 words)
Non-compaction of the myocardium is gaining prominence as a rare, distinct cardiomyopathy characterised by the presence of numerous, excessive prominent trabeculations and deep intertrabecular recesses which communicate with the left ventricular cavity.
During early embryogenesis, trabeculations emerge in the luminal myocardial layers of the ventricles enabling the myocardium to increase its mass in the absence of epicardial coronary circulation.
Non-compacted myocardium was previously described as persistent intramyocardial sinusoids; however, the latter are associated with congenital obstructive lesions of the left or right ventricular outflow tract, such as pulmonary atresia with intact ventricular septum.
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