. Anatomy in a nutshell : a treatise on human anatomy in its relation to osteopathy. Human anatomy; Osteopathic medicine; Osteopathic Medicine; Anatomy. ANATOMY IN A NUTSHELL. 241 heart. Its walls are one-third as thick as those of the left ventricle, and it holds about three ounces. Its posterior surface rests upon the Diaphragm forming a small part of the back of the heart, while its anterior surface forms most of the front of the heart. 1. The conus arteriosus or infundibulum is a conical pouch at the upper and left angle of the ventricle, from which the pulmonary artery arises. 2. The auri
. Anatomy in a nutshell : a treatise on human anatomy in its relation to osteopathy. Human anatomy; Osteopathic medicine; Osteopathic Medicine; Anatomy. ANATOMY IN A NUTSHELL. 241 heart. Its walls are one-third as thick as those of the left ventricle, and it holds about three ounces. Its posterior surface rests upon the Diaphragm forming a small part of the back of the heart, while its anterior surface forms most of the front of the heart. 1. The conus arteriosus or infundibulum is a conical pouch at the upper and left angle of the ventricle, from which the pulmonary artery arises. 2. The auriculo-ventrieular opening has been described with the auricle. 3. The opening of the pulmonary artery which lies at the summit of the infundibulum is circular. It is guarded by the pulmonary semilunar valves. 4. The tricuspid valve consists of three portions. The largest of these segments, called the left or infundibular flap, lies at the left and front of the opening. The right flap is to the front and right, while the third, called the posterior or septal flap, is posteriorly. The center of each of these flaps is thick, the lateral margins are thin. 5. The chorda? tendinae are fibrous cords which are attached to the mar- PLATE XCVII. A, U^t? ANT. ARCH BODY. Anterior View of Axis. gins and ventricular surfaces of each of these flaps. Three or four are attached t the liases of each flap and are continuous with the fibrous ring which surrounds the auriculo-ventrieular opening. Four to six pass to the central part of these flaps, and the finest and most numerous go to the free margins of these flaps. 6. Column;? earneae project from the walls of the ventricle except near the pulmonary opening. They are divided into three sets, the first set are at- tached throughout their length thus forming mere ridges. The second sel called trabecular, are attached to their ends only, thus forming arches, while the third 3e1. <;tlled musculi papillares, are attached to on
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