12 Key and Core Catalog With a mechanical key system, the level of security is determined by masterkey control. A masterkey system enables facilities of any size to manage the building by defining access by person and by area in increasing levels of complexity. Since BEST invented the standard for masterkey systems, there is no
When they occur in the upper part of the aorta, they are called thoracic aortic aneurysms. Aneurysms can occur anywhere in the thoracic aorta, including the ascending aorta near the heart, the aortic arch in the curve of the thoracic aorta and the descending aorta in the lower part of the thoracic aorta.
pl. aortae, aortas [L.] the great artery arising from the left ventricle, being the main trunk from which the systemic arterial system proceeds. See Table 9. See also aortic. abdominal aorta. the part of the descending aorta within the abdomen. ascending aorta. the first part of the aorta which passes dorsally and cranially. descending aorta. the aorta after it turns caudally at the aortic arch. overriding aorta. see overriding aorta. supravalvular aorta. the portion of aorta immediately above the aortic valve. terminal aorta. the segment of the aorta immediately before it divides into the iliac arteries.