Final answer:
The correct term used to describe the mucous plug that forms in the endocervical canal is operculum. The operculum helps to protect the uterus from infection and can function as a barrier during pregnancy or help sperm enter the uterus during ovulation.
Step-by-step explanation:
The correct term used to describe the mucous plug that forms in the endocervical canal is operculum. The cervix is a neck-like structure that connects the vagina and the uterus. It produces mucus that can function as a barrier during pregnancy or help sperm enter the uterus during ovulation. The mucous plug, or operculum, helps to protect the uterus from infection.