Corresponds to the anterior. (Costomediastinal) line of pleural reflection. 2. It is deeply notched in the left lung posterior. to 5th costal cartilage by the pericardium costal cartilage by the pericardium. and extends vertically downwards to form. Lingula.
Generally speaking, a principle is a rule, standard, or belief of one kind or another. As an adjective, principal means âmost importantâ, while a principal is â generally speaking â a person who is most important in a particular organization or group.
What is a 'Principal'. Principal is most commonly used to refer to the amount borrowed or the amount still owed on a loan, separate from interest. If you take out a $50,000 loan, for example, the principal is $50,000, so if you pay off $30,000, the remaining $20,000 left to repay is also called the principal. BREAKING DOWN 'Principal'.