. Elementary physiology . Fjg. 53.—Transverse section through the thorax. The section is carried above the heart, but below the division of the trachea. I, sternum; 2, body of dorsal vertebra; 3, spinous Drocess; 4, spinal canal; 5, rib; 6, inner layer of pleura ; 7, outer layer of pleura; 8, pericardium; 9, right bronchus ; 10, left bronchus; 11, oesophagus; 12, heart; 17, aorta, ascending; 14, aorta, descending; 15, left lung; 16, right lung; 17, pulmonary arteries. and close to the vertebral column in the thorax to enter the thin-walled right upper chamber of the heart {the right auricle).
. Elementary physiology . Fjg. 53.—Transverse section through the thorax. The section is carried above the heart, but below the division of the trachea. I, sternum; 2, body of dorsal vertebra; 3, spinous Drocess; 4, spinal canal; 5, rib; 6, inner layer of pleura ; 7, outer layer of pleura; 8, pericardium; 9, right bronchus ; 10, left bronchus; 11, oesophagus; 12, heart; 17, aorta, ascending; 14, aorta, descending; 15, left lung; 16, right lung; 17, pulmonary arteries. and close to the vertebral column in the thorax to enter the thin-walled right upper chamber of the heart {the right auricle). The blood coming from the head, neck, and arms is collected into another great vein (the supenor vena cava), and by this is also discharged into the right auricle. From the right auricle the blood flows into the right ventricle, being assisted in its flow towards the end when the ventricle is nearly full by the contraction of the auricle, which distends the ventricle.^ The ' For a description of the heart and its valves, see the anatomy of the circulatory system, p. 113; an outline only is given here to enable the student to understand the arrangement of the great vessels in the thorax. G
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