Why is the endocardium made of simple squamous epithelium?
The simple squamous epithelium provides a smooth surface for the blood to “slide past.” The tunica intima is continuous with the endocardium, makes-up the capillaries and is collectively referred to as the endothelium. This is the middle layer. It is made of smooth muscle and elastic fibers.
What two types of tissue make up the endocardium?
The endocardium has two layers. The inner layer lines the heart chambers and is made of endothelial cells. Superiorly, is the second layer: a subendocardial connective tissue which is continuous with the connective tissue of the myocardium.
Is the endocardium epithelium?
Tunica Intima (Endocardium) This diagram shows that the simple squamous epithelium of the tunica adventitia layer of the heart (mesothelium) is also the visceral layer of the serous pericardium.
What type of tissue is the endocardium made of?
connective tissue
The endocardium is composed of the endothelium and the subendothelial connective tissue layer. The subendocardium is found between the endocardium and myocardium and contains the impulse-conducting system.
What is the difference between the endocardium of the atria and ventricles?
The endocardium is a delicate layer that invests the entire inner surface of the heart. Endocardium is thicker in the atria than in the ventricles, in the left- than in the corresponding right-sided chambers, and in the outflow tracts than in the inflow tracts of the ventricles. …
What is epithelial tissue?
The epithelium is a type of body tissue that forms the covering on all internal and external surfaces of your body, lines body cavities and hollow organs and is the major tissue in glands.
What is the role of the endocardium?
Anatomic function: A tissue covering the inside of the heart, the endocardium keeps the blood flowing through the heart separate from the myocardium, or cardiac muscles. It also lines the valves, which open and close to regulate blood flow through the chambers of the heart.
What is the epithelial tissue in the heart?
The epicardium includes a layer of simple squamous epithelium called the mesothelium and the underlying supportive connective tissue. The epicardium is the outermost layer surrounding the heart, and is comparable to the tunica adventitia of vessels.
What are a atria?
The two atria are thin-walled chambers that receive blood from the veins. The two ventricles are thick-walled chambers that forcefully pump blood out of the heart. The right atrium receives deoxygenated blood from systemic veins; the left atrium receives oxygenated blood from the pulmonary veins.
How does the endocardium protect the heart?
What is the structure of the endocardium?
The endocardium (black arrows) lines the heart chambers and is continuous with the tunica intima of blood vessels. It consists of a simple squamous epithelium (endothelium), an underlying layer of subendothelial connective tissue that may contain smooth muscle fibers, and a deeper layer of subendocardial connective tissue.
What does simple squamous epithelium mean?
The simple in the term simple squamous epithelium means there is one layer of flat-shaped (Squamous) cells in simple squamous epithelial tissue. Simple squamous epithelial tissue is only composed of multiple squamous or flat-shaped cells in the epithelial tissue.
What is the structure of the subendocardial layer?
It consists of a layer of loose fibrous tissue, containing the vessels and nerves of the conducting system of the heart. The purkinje fibres are located in this layer. As the subendocardial layer houses the conducting system of the heart, damage to this layer can result in various arrhythmias.
What is mesothelium lining the epicardium?
The outer part of the epicardium is lined with mesothelium: the epithelium lining the walls and contents of the closed cavities of the body, such as the thoracic, pericardial and abdominal cavities Modified cardiac muscle cells with a diameter about twice that of regular fibers (30 vs. 15 micrometers)