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.
A source of authority; a sum of a debt or obligation producing interest; the head of a school. In an agency relationship, the principal is the person who gives authority to another, called an agent, to act on his or her behalf. In Criminal Law, the principal is the chief actor or perpetrator of a crime; those who aid, abet, counsel, command, or induce the commission of a crime may also be principals.