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The heart is a muscular organ situated in the mediastinum.It consists of four chambers, four valves, two main arteries (the coronary arteries), and the conduction system. The left and right sides of the heart have different functions: the right side receives de-oxygenated blood through the superior and inferior venae cavae and pumps blood to the lungs through the pulmonary artery, and the left ...
The papillary muscles of both the right and left ventricles begin to contract shortly before ventricular systole and maintain tension throughout. [1] This prevents regurgitation—backward flow of ventricular blood into the atrial cavities—by bracing the atrioventricular valves against prolapse—being forced back into the atria by the high ...
Pectinate muscles make up the part of the wall in front of this, the right atrial appendage. [citation needed] In the left atrium, the pectinate muscles are confined to the inner surface of its atrial appendage. [1] They tend to be fewer and smaller than in the right atrium.
The trabeculae carneae and the papillary muscles make up a significant percentage of the ventricular mass in the heart (12-17% in normal human adult hearts), and are correlated with ventricular end diastolic volume. [5] Trabeculae ratios of capillary-to myocyte differ between the walls of the right and left ventricle.
Neck, Suprahyoid, Right/left mandibular symphysis: anterior surface of body of hyoid bone: C1 via hypoglossal nerve: elevates hyoid and tongue upward during swallowing?? 2 1 sternohyoid: Neck, Infrahyoid, Right/left sternum, manubrium: hyoid bone: superior thyroid artery: ansa cervicalis: depresses hyoid?? 2 1 sternothyroid: Neck, Infrahyoid ...
In humans, the heart is divided into four chambers: upper left and right atria and lower left and right ventricles. [5] [6] Commonly, the right atrium and ventricle are referred together as the right heart and their left counterparts as the left heart. [7]
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An X-ray of a human chest area, with some structures labeled. The contents of the thorax include the heart and lungs (and the thymus gland); the major and minor pectoral muscles, trapezius muscles, and neck muscle; and internal structures such as the diaphragm, the esophagus, the trachea, and a part of the sternum known as the xiphoid process.