Which layer of the heart contains Purkinje fibers?
Which layer of the heart contains Purkinje fibers?
endocardium
Purkinje fibres lie in the deepest layer of the endocardium and supply the papillary muscles.
Where are Purkinje fibers found in the heart?
sub-endocardium
The purkinje fibres are found in the sub-endocardium. They are larger than cardiac muscle cells, but have fewer myofibrils, lots of glycogen and mitochondria, and no T-tubules.
Which layers of the heart contain muscle fibers?
Myocardium. The middle layer of the heart wall is the myocardium—the muscle tissue of the heart and the thickest layer of the heart wall. It is composed of cardiac muscle cells, or cardiomyocytes.
What are Purkinje fibers in heart?
Purkinje fibers are part of the specialized conduction network of the heart that ensures that the wave of excitation spreads rapidly and almost synchronously to the ventricular muscle mass.
What are Purkinje Fibres in heart?
Purkinje fibers are specialized conductive myocardial cells with few myofibrils that promotes the rapid conduction of the impulse through the ventricles. They are larger than the normal myocardial fibers. The waves of depolarization ultimately spread to adjacent myocardial cells through the intercalated discs.
Which layer of the heart contains nerve fibers and fat?
The epicardium is a thin layer of elastic connective tissue and fat that serves as an additional layer of protection from trauma or friction for the heart under the pericardium. This layer contains the coronary blood vessels, which oxygenate the tissues of the heart with a blood supply from the coronary arteries.
What are the 3 layers that make up the heart walls?
Three layers of tissue form the heart wall. The outer layer of the heart wall is the epicardium, the middle layer is the myocardium, and the inner layer is the endocardium.
Which layer of the heart wall consists of mesothelium and connective tissue?
1. The wall of the heart has three layers: epicardium, myocardium, and endocardium (Figure 20.2a). 2. The epicardium consists of mesothelium and connective tissue, the myocardium is composed of cardiac muscle, and the endocardium consists of endothelium and connective tissue (Figure 20.2c).
Which layer of the heart is composed of complex spiraling bands of cardiac muscle fibers?
Myocardium
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.
Where are the Purkinje fibers found in the heart?
The middle layer is the thickest layer of the wall and is made primarily of cardiac muscle. This innermost layer is thin and very smooth, and stretches as the heart pumps blood. This layer of the heart wall contains the Purkinje fibers. Has three cusps and is situated between the right atrium and the right ventricle.
What is the layer composed of cardiac muscle?
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.
Which is the thinmost layer of the heart wall?
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.
What makes up the epicardium layer of the heart?
The epicardium is composed primarily of loose connective tissue, including elastic fibers and adipose tissue. The epicardium functions to protect the inner heart layers and also assists in the production of pericardial fluid. This fluid fills the pericardial cavity and helps to reduce friction between pericardial membranes.