Volume 1

The surgical anatomy of the arteries of the human body / [Robert Harrison].

  • Robert Harrison
Date:
1829
Catalogue details

Licence: Public Domain Mark

Credit: The surgical anatomy of the arteries of the human body / [Robert Harrison]. Source: Wellcome Collection.

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    commences abruptly at the termination of the fibres of the Heart by three semicircular portions, whose convexity is turned towards the Ventricles, the fleshy fibres of which are inserted into the edge of each of these festoons ; these cover the small pouches (the Sinuses of Morgagni) that lie outside the Semilunar Valves ; and thus these sinuses are rendered sufficiently firm to resist distension, as the blood is strongly pushed into them during the sys- tole of the arteries. In the angle between the ex- tremities of two of these, the wall of the artery is formed only by the lining membrane of the Heart and serous layer of the Pericardium, which are here in apposition. If the opening of the Aorta be in- spected from the cavity of the Ventricle, it appe£}rs of a triangular shape, and of much smaller caliber than the artery is immediately above this, for it then swells out into the Sinuses of Morgagni. If the attention of the student be directed to the relation which the origin of the Aorta bears to cer- tain points in the parieties of the Thorax, he will find that this part of the artery is opposite the upper edge of the cartilage of the fourth Rib of the left side, at its junction to the Sternum, and to the left side of the body of the fourth Dorsal Vertebra. The vessel, emerging from the Pulmonary Artery and tip of the right Auricle, passes upwards, forwards, and in the direction of the heart’s axis, to the right side; then bends backwards and to the left side, and descending as far as the left side of the body of the third Dorsal Vertebra, completes what is called the arch of the Aorta. This arch, for the purpose of
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