Section I., OF THE AHTERIBS. The arterial system consists of numerous flexible and ramifying tubes, arteria, which convey the Wood from the heart to all parts of the body. These vessels derived their name from the ancients, who seeing them empty after death, concluded that they contained air or vapour during life.<Callout type="important" title="Important">The aorta arises from the left ventricle and is the common source of the arteries of the body; the pulmonary artery springs from the right ventricle and supplies the arterial tubes of the lungs.</Callout> The connexion of these trunks with the heart is rather of a peculiar character; the lining membrane of the ventricle is prolonged into the corresponding artcr)', and thus constitutes a direct union between the two parts. When this membrane is carefully raised, it is seen that the proper, or fibrous coat of the artcr)', which is in no manner continuous with the fleshy pariete-s of the heart, is at the beginning divided into three semicircular festoons, which correspond to the sigmoid valves, and leave between them as many small triangular spaces. The borders of these festoons are firmly attached to the orifice of the ventricle by a quantity of ligamentous tissue, and a similar substance fills up the triangular intervEilii just described.<Callout type="warning" title="Warning">Be cautious when examining arterial structures; improper handling can cause injury.</Callout> The arteries present, like the vascular system in general, an arborescent form, the branches successively diminishing in size and increasing in number, as they pass from the heart towards their ultimate termination. Each trunk usually ends by dividing into two or more branches, the size of which may be either equal or unequal; but whatever be their relative capacity to each other, it is found that with few or no exceptions, their combined area is greater than the area of the vessel from which they spring, The ratio of this excess being liable to great variation, cannot be determined with any precision ; but, according to Haller, the capacity of the branches exceeds that of the trunks whence they proceed, in the proportion of 1^ to 1, or rather less.
Key Takeaways
- The aorta and pulmonary artery are the main arteries arising from the left and right ventricles of the heart respectively.
- Arterial structures have a direct union with the heart through prolonged membranes.
- Arteries form an arborescent network, with branches increasing in number but decreasing in size.
Practical Tips
- Understanding arterial anatomy is crucial for recognizing signs of injury and ensuring proper first aid techniques.
- Be cautious when examining or treating arterial injuries to avoid causing further harm.
- Knowledge of the arterial system can help in identifying potential sources of bleeding during triage.
Warnings & Risks
- Improper handling of arteries can lead to serious complications, including infection or damage to surrounding tissues.
- Arterial structures are delicate and require careful examination; avoid applying excessive pressure or force.
Modern Application
While the specific terminology and methods described in this chapter may differ from modern medical practices, understanding the basic structure of the arterial system remains crucial for survival medicine. This knowledge can help in recognizing arterial injuries, performing effective first aid, and ensuring proper triage during emergencies.
Frequently Asked Questions
Q: What are the main arteries arising from the heart?
The aorta arises from the left ventricle and is the common source of the arteries of the body; the pulmonary artery springs from the right ventricle and supplies the arterial tubes of the lungs, as described in the chapter.
Q: How are the arteries connected to the heart?
The lining membrane of the ventricle is prolonged into the corresponding artery, creating a direct union between the two parts. This connection can be seen when carefully examining the arterial structures.
Q: What does the chapter say about the structure of arteries?
Arteries form an arborescent network where branches successively diminish in size and increase in number as they move from the heart towards their ultimate termination. The combined area of these branches is generally greater than that of the vessel from which they spring.