Nadu Medical Service Rules. It contains two parts namely, Branch-I Medical and Branch-II Nursing. As far as the medical cadre is concerned, as per Rule 2, it is divided into Civil Surgeon cadre and Assistant Surgeon cadre. All the entry level posts of Assistant Surgeon in the general line, Non-Clinical Lectures, Tutors / Assistant Professors, Clinical Lecturers, Senior Residents / Assistant Professors and the Women State Family Planning Officer are all grouped under the cadre of Assistant Surgeon. Thus, it can be seen that there is no such post as such called 'Medical Officer'. But, the term 'Medical Officer' is widely used in the rules to denote every registered medical practitioner appointed to any post. When it comes to deputing personnel for the Chennai City Police, they are called Medical Officers to the Chennai City Police. The Senior Residents are also termed as 'Resident Medical Officers' Similarly, the term 'Medical Officer' is generally used in the context of referring to the person who is working in any capacity with the qualified medical degree (in common parlance, the Doctors working in the department).