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Nov 3, 2023 · It happens with the heart cycle, which consists of the periodical contraction and relaxation of the atrial and ventricular myocardium (heart muscle tissue). Systole is the period of contraction of the ventricular walls, while the period of ventricular relaxation is known as diastole.
- Surface Projections of The Heart
Borders of the heart. The heart is placed within the middle...
- Innervation of The Heart
The innervation of the heart refers to the network of nerves...
- Diagrams, Quizzes and Worksheets of The Heart
Using our unlabeled heart diagrams, you can challenge...
- Coronary Arteries
Coronary arteries and cardiac veins. The heart is a...
- Ductus Arteriosus
Ligamentum arteriosum (also known as Ligament of Botallo or...
- Atria
Basic anatomy of the heart. The heart is at the center of...
- Ventricles
The definition of heart ventricles can be summed up as the...
- Heart Valves
Understanding heart valves anatomy is important in grasping...
- Surface Projections of The Heart
Nov 10, 2024 · These chambers are separated by valves and muscular septa, which direct blood flow and maintain efficient circulation. The heart wall is composed of three layers: the epicardium, myocardium, and endocardium. External Anatomy of the Heart. Apex and Base: The apex of the heart is the pointed lower tip that is oriented downward and to the left. It ...
- Regina Bailey
- 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.
Nov 3, 2023 · The myocardium is functionally the main constituent of the heart and the thickest layer of all three heart layers. It is a muscle layer that enables heart contractions. Histologically, the myocardium is comprised of cardiomyocytes .
The atria and ventricle on each side of the heart are linked together by valves that prevent backflow of blood. The wall that separates the left and right side of the heart is called the septum. The left heart deals with systemic circulation, while the right heart deals with pulmonary circulation.
Oct 4, 2019 · Cardiac muscle, also known as heart muscle, is the layer of muscle tissue which lies between the endocardium and epicardium. These inner and outer layers of the heart, respectively, surround the cardiac muscle tissue and separate it from the blood and other organs.
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Oct 20, 2024 · Within the mediastinum, the heart is separated from the other mediastinal structures and is held in place by a tough wrapping known as the pericardium, or pericardial sac. The sac also limits the range of motion of the heart as it beats.
