The common aorta or aortic trunk is the main systemic arterial trunk. It begins at the base of the left ventricle passes backwards and forwards between the pulmonary artery on the left and right atrium on the right (first part-ascending aorta), turns upwards and backwards inclining slightly to the left, thus describing a curve called […]
The pulmonary veins are usually 4 to 7 in number and are devoid of valves. The capillaries arise from plexus around the alveoli of the lungs, unite to form larger branches accompanying the arterial branches on the ventral face of the bronchioles and finally form the pulmonary veins which open into the left atrium.
The pulmonary artery springs from the right ventricle at the conus arteriosus. It curves upward, backwards and medially and divides behind the aortic arch into right and left pulmonary arteries. It is related in front to the right atrium and behind to the left atrium and medially to the aorta. It is enclosed along with
Pulmonary and systemic circulation include these veins and arteries- Pulmonary artery Pulmonary veins Aorta Common brachiocephalic trunk Coronary arteries Brachial artery Oesophageal artery Intercostal arteries and Phrenic arteries
The parts concerned in the controlling and conducting mechanism of the heart are composed of myocardial tissue distinguished from the ordinary cardiac muscle, not only because it is less highly differentiated from the original cells, but also because the muscle fibres are intimately associated with numerous nerve cells and fibrils which probably have a share
The tissues that form the skeletal structure of the heart are four annular fibrous rings, two small bones, the muscle, serous membrane, vessels and nerves. Fibrous rings The fibrous rings are four in number-two at the atrio-ventricular openings and two at the arterial openings. The former separate the muscle fibres of the atria from those of
Horse The base is broader and the length from the base to apex is shorter. The long axis is more oblique. The anterior border is more strongly convex. It weighs about 2.9 kg to 3.1 kg. The intermediate groove is absent. Instead of os cordis, the aortic ring contains on the right side a plate
LEFT VENTRICLE OF HEART The left ventricle forms the left posterior part of the ventricular mass. It is more regularly conical and its wall is much thicker than the right ventricle. It forms the entire posterior contour of the heart and carries the apex of the heart. The base is continuous with the left atrium
LEFT ATRIUM OF HEART The left atrium forms the posterior part of the base of the heart. It lies behind the pulmonary artery and aorta and above the ventricle. It consists of a sinus and an auricle. The later extends on the left side and its blind end lies behind the origin of the pulmonary
RIGHT VENTRICLE OF HEART The right ventricle forms the anterior part of the ventricular mass and forms the anterior border of the heart. It does not reach the apex of the heart. It is triangular in outline and crescentric on cross section. It communicates above at the base with the right atrium through the right
