Outline of a Course of Lectures On Human Physiology
Outline of a Course of Lectures On Human Physiology
Ernest Albert Parkyn
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From the anterior arises the Right Coronary Artery ; from the left posterior the Left Coronary Artery. The coronary arteries run in the auriculo- ventricular grooves, and send main branches between the ven- tricles along the ventricular grooves. It is a debated point whether, when the semilunar valve is open, its flaps cover over the orifices of the coronary arteries so as to prevent the entrance into them of blood at that moment. Arrangement of Muscles of the Heart is very complicated, and ver...y incompletely understood. The fibres have an oblique direction, and are disposed apparently in a number of more or less distinct layers. Within the muscular substance are found bloodvessels, lymphatics, and nerves. The latter are derived from the vagus nerve and from the cervical and superior thoracic ganglia of the sympathetic. They form gangliated plexuses. II. The Arteries are tubes with strong, extensible, elastic walls. A typical artery has three coats, (i) Internal, lined by a layer of epithelioid cells, beneath which is a homogeneous sub- epithelioid layer containing scattered branched cells.
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