There are several different types of articles related to nursing:
Abstract - A short summary of the study and the conclusions made.
Introduction - Discusses the problem(s) addressed in the article and gives background information.
Literature Review - Summarizes previous studies/articles written about the same topic.
Methodology - Describes the research design in enough detail that the experiment could be replicated.
Results - Explanation of the data collected during the study.
Discussion/Conclusions - Analysis of the results and thoughts on whether or not further study is needed.
References - Sources used by the author to conduct the study or the literature review.