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 principal is someone who is the leader of an entire community within a school. He or she is responsible for managing the major administrative tasks and supervising all students and teachers. They are also known as head masters in some countries, as well as a few select schools in the United States.