子宫颈是阴道通向子宫腔的管道,也是予防病原体侵入子宫的重要防线,在正常情况下,由于宫颈腺体的分泌,宫颈管内为粘稠的分泌物(粘液栓)所充塞,可以阻挡病原体侵入子宫腔.但当机体抵抗力降低,阴道受各种物理、化学、生物等因素刺激,就会发生上皮浸软、上皮脱落等病变,因而更易受到病原体的侵袭而发生感染. The cervix is ​​the vagina to the uterine cavity of the pipeline, but also to prevent pathogens invade the uterus an important line of defense, under normal circumstances, due to the secretion of cervical glands, cervical canal thick viscous secretions (mucus plug) stuffed, can stop pathogens Invade the uterine cavity.But when the body resistance is reduced, the vagina by a variety of physical, chemical, biological and other factors, there will be epithelial immersion, epithelial shedding and other diseases, and thus more susceptible to the invasion of pathogens and infection.