What are the four layers of the heart wall?

What are the four layers of the heart wall?

17.1C: Layers of the Heart Walls

• Epicardium.
• Myocardium.
• Endocardium.

What is the parietal layer of the heart?

Parietal pericardium: The outer layer of the pericardium which is a conical sac of fibrous tissue that surrounds the heart and the roots of the great blood vessels. The pericardium has outer and inner coats.

How many parts of the heart are there?

The heart is made up of four chambers. The upper two chambers are called atria (singular: atrium) and the lower two are known as ventricles (singular: ventricle). Muscular walls, called septa or septum, divide the heart into two sides.

How many valves are in the heart?

The four heart valves include the following: tricuspid valve: located between the right atrium and the right ventricle. pulmonary valve: located between the right ventricle and the pulmonary artery. mitral valve: located between the left atrium and the left ventricle.

What are the 2 layers that cover the heart?

The pericardium is a thin-walled structure composed of two layers, a serous visceral layer (epicardium) and a fibrous parietal layer, both of which surround and protect the heart.

What 2 layers make up the pericardium?

The pericardium consists of two layers: the fibrous and the serous. The fibrous pericardium is a conical-shaped sac.

What are 12 parts of the heart?

Anatomy of the heart

• Left atrium and auricle. Left atrium. Left auricle.
• Right atrium and auricle. Right atrium. Right auricle.
• Interventricular septum and septal papillary muscles. Interventricular septum.
• Right ventricle and papillary muscles. Right ventricle.
• Left ventricle and papillary muscles. Left ventricle.

What are the layers of the heart in order?

The heart wall is divided into three layers: epicardium, myocardium, and endocardium. Epicardium : the outer protective layer of the heart. Myocardium: muscular middle layer wall of the heart. Endocardium : the inner layer of the heart.

What is the innermost layer of the heart?

The innermost layer of the heart is called the endocardium. It is made up of a lining of simple squamous epithelium and covers heart chambers and valves. It is continuous with the endothelium of the veins and arteries of the heart, and is joined to the myocardium with a thin layer of connective tissue.

What is the structure of the heart?

Structure of the Heart. The human heart is a four-chambered muscular organ, shaped and sized roughly like a man’s closed fist with two-thirds of the mass to the left of midline. The heart is enclosed in a pericardial sac that is lined with the parietal layers of a serous membrane.

What is the membrane of the heart?

The pericardium is a thin membrane that encloses the heart and the base of the great vessels of the heart (aorta, vena cava, pulmonary artery and pulmonary vein). It is composed of to layers. The visceral layer is attached to the heart surface and then folds back on itself to form the parietal layer.