Describe the position and attachments of parietal pericardium heart cat?

The parietal pericardium in cats is a thin, fibrous sac with a serosal lining that encloses the heart. It has a close relationship with the fibrous skeleton of the heart and is continuous with the adventitia of the great vessels at the base of the heart. The parietal pericardium is attached to the diaphragm and sternum ventrally, and to the vertebral column and mediastinum dorsally. It also sends reflections around the roots of the great vessels to form the pericardial sinuses:

1. Transverse pericardial sinus: This sinus is formed between the parietal pericardium and the base of the heart. It contains the roots of the pulmonary trunk, aorta, and vena cavae.

2. Oblique pericardial sinus: This sinus is located to the left of the heart and separates the pulmonary trunk and the left atrium.

The pericardial sinuses play a role in supporting and cushioning the heart and great vessels. Additionally, the parietal pericardium provides protection and lubrication to the heart, preventing excessive movement and potential friction during its functioning.