Final answer:
Cervical intraepithelial neoplasia (CIN) is the term for a large number of precancerous changes involving only cells on the surface of the cervix. It is divided into three grades: CIN1, CIN2, and CIN3. Regular screening through Pap smears can help detect and manage these changes early on.
Step-by-step explanation:
The term for a large number of precancerous changes involving only cells on the surface of the cervix is Cervical intraepithelial neoplasia (CIN). CIN is a condition where the cells on the surface of the cervix show abnormal changes but have not yet become cancerous. CIN is divided into three grades based on the extent of the abnormal changes: CIN1, CIN2, and CIN3.
CIN1 represents mild abnormalities, CIN2 represents moderate abnormalities, and CIN3 represents severe abnormalities. If left untreated, CIN3 can progress to invasive cervical cancer. Regular screening through Pap smears can help detect and manage these changes early on.