Each repetition of its back and forth motion is a little less vigorous than its previous repetition. If the head sways 3 cm to the right of its equilibrium position during the first repetition, it may only sway 2.5 cm to the right of its equilibrium position during the second repetition.
The majority of the heart is myocardium or cardiac muscle tissue. The endocardium is a thin layer of endothelium that lines the chambers of the heart and the valves. Pericardium. The pericardium (around the heart) is a triple-layered fluid-filled sac that surrounds the heart.
Related terms: pericardium, inflammation of the heart membrane. The pericardium is a thin, sac-like covering (a membrane) that surrounds your heart. The outer layer of the pericardium surrounds the roots of your heart's major blood vessels.Ligaments attach this layer to your spinal column, diaphragm, and other parts of your body. The inner layer of the pericardium is attached to the heart muscle.elated terms: pericardium, inflammation of the heart membrane. The pericardium is a thin, sac-like covering (a membrane) that surrounds your heart. The outer layer of the pericardium surrounds the roots of your heart's major blood vessels.