. The anatomy of the human body. Human anatomy; Anatomy. THE AORTA. 501 artery itself, the course of which vessel it pursues ; at this time the right and left branch- es of the pulmonary artery are very small. At birth the whole of the venous blood pro- ceeds to the lungs, none of it passing through the ductus arteriosus, which then becomes obliterated. THE AORTA. Preparation.—Definition.—Situation.—Direction.—Size.—Divisio7i into the Arch of the Aor- ta, the Thoracic Aorta, and the Abdominal Aorta. Preparation.—The aorta may be studied without having been injected.* In order to study it in an
. The anatomy of the human body. Human anatomy; Anatomy. THE AORTA. 501 artery itself, the course of which vessel it pursues ; at this time the right and left branch- es of the pulmonary artery are very small. At birth the whole of the venous blood pro- ceeds to the lungs, none of it passing through the ductus arteriosus, which then becomes obliterated. THE AORTA. Preparation.—Definition.—Situation.—Direction.—Size.—Divisio7i into the Arch of the Aor- ta, the Thoracic Aorta, and the Abdominal Aorta. Preparation.—The aorta may be studied without having been injected.* In order to study it in an injected subject, the median incision made for the purpose of introducing the injection must be prolonged down to the pubes. Then disarticulate the clavicles, separate the two sides of the thorax, even so far as to break some of the ribs, and keep them separate by introducing a piece of wood ; cut through the abdominal parietes, and turn the left lung over to the right side. The aorto {aoprri, arteria magna, arteriarum omnium mater, ah c 198), the com- mon origin of all the arteries of the human body, commences at the left ventricle, and terminates by bifurcating (at d) opposite the fourth lumbar vertebra. Situation.—It is situated deeply in the thoracic and abdominal cavities, along the ver- tebral column, which affords it both support and protection. In those animals in which the aorta is prolonged beyond the trunk, the vertebral column accompanies the vessel, and forms a bony canal or sheath for it, distinct from the canal for the spinal cord. Direction.—Immediately after its origin, the aorta advances towards the right side {a, Fig. 198. Jig. 198), and almost directly afterward pro- ceeds upward, describing a slight curve, the con- vexity of which is turned forward and to the right, and the concavity backward and to the left. After leaving the pericardium, it changes its direction, becomes suddenly curved, and passes almost horizontally from the righ
Size: 1117px × 2237px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, booksubjectanatomy, booksubjecthumananatomy
