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Aug 26, 2013 · The pericardial layers and layers of the heart wall. The third layer of the heart wall is called the endocardium. It is a white sheet of endothelium (squamous epithelium) resting on a connective tissue layer. It is located on the inner myocardial surface and lines the heart chambers.
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- Epicardium. Epicardium (epi-cardium) is the outer layer of the heart wall. It is also known as visceral pericardium as it forms the inner layer of the pericardium.
- Myocardium. Myocardium (myo-cardium) is the middle layer of the heart wall. It is composed of cardiac muscle fibers, which enable heart contractions. The myocardium is the thickest layer of the heart wall, with its thickness varying in different parts of the heart.
- Endocardium. Endocardium (endo-cardium) is the thin inner layer of the heart wall. This layer lines the inner heart chambers, covers heart valves, and is continuous with the endothelium of large blood vessels.
Muscular ridges in the anterior atrial wall and inner surface of the auricle. Muscular ridges in the internal surface of the ventricle. Thin-walled chambers of the heart that receive venous blood. External visible flaps that form by the collapse of the outer wall of a relaxed atrium.
Inside the pericardium, the surface features of the heart are visible, including the four chambers. There is a superficial leaf-like extension of each atrium near the superior surface of the heart, one on each side of the pulmonary trunk, called an auricle—a name that means “ear like”—because its shape resembles the external ear of a ...
Jan 4, 2024 · The innermost layer of the cardiac wall is known as the endocardium. It lines the cavities and valves of the heart. Structurally, the endocardium is comprised of loose connective tissue and simple squamous epithelial tissue – it is similar in its composition to the endothelium which lines the inside of blood vessels.
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Sep 14, 2021 · Our exploration of more in-depth heart structures begins by examining the membrane that surrounds the heart, the prominent surface features of the heart, and the layers that form the wall of the heart. Each of these components plays its own unique role in terms of function.
Nov 3, 2023 · The endocardium is the innermost layer of the heart. It lines the inner surfaces of the heart chambers, including the heart valves. The endocardium has two layers. The inner layer lines the heart chambers and is made of endothelial cells.
