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Cervix: Function, Anatomy & Conditions

The cervix is the lower part of the uterus connecting it to the vagina. It plays a key role in menstruation, fertility, pregnancy, and childbirth.

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The cervix is the lower part of the uterus connecting it to the vagina. It plays a key role in menstruation, fertility, pregnancy, and childbirth.

What is the Cervix?

The cervix (Latin: Cervix uteri), also referred to as the neck of the womb, is the lower, narrow portion of the uterus that connects the uterine cavity to the vagina. It is a vital part of the female reproductive system, serving important protective and functional roles throughout a woman's life.

The cervix has two main openings: the external os, which opens into the vagina, and the internal os, which leads into the uterine cavity. The passage between them is called the cervical canal.

Anatomy and Structure

The cervix is composed of specialized tissue. The cervical canal is lined with columnar epithelial cells that produce mucus, while the outer cervix is covered with squamous epithelium, similar to the lining of the vagina. The boundary between these two tissue types is called the transformation zone, which is clinically significant because it is where most cervical cell changes and cancers develop.

External os: Appears round in women who have not given birth vaginally; becomes slit-shaped after vaginal delivery.
Cervical canal: Approximately 2–3 cm long, lined with mucus-secreting glands.
Internal os: Transition point into the uterine cavity.

Functions of the Cervix

Protective Barrier

The cervical mucus produced in the cervical canal forms a natural barrier against bacteria and other pathogens ascending from the vagina into the uterus. The consistency of this mucus changes throughout the menstrual cycle.

Role in the Menstrual Cycle

Around the time of ovulation, cervical mucus becomes thinner and more slippery, facilitating the passage of sperm. During the second half of the cycle, the mucus thickens again to form a mucus plug, blocking the entry of microorganisms.

Role During Pregnancy

During pregnancy, the cervix remains firmly closed and is sealed by a thick mucus plug (cervical plug) that protects the developing baby from infection. Toward the end of pregnancy, under hormonal influence and fetal pressure, the cervix begins to soften, shorten, and dilate in a process known as cervical ripening.

Role During Childbirth

During labor, the cervix progressively dilates. A full dilation of 10 centimeters is required for the baby to pass through the birth canal. Obstetricians and midwives regularly assess cervical dilation and effacement throughout labor.

Clinical Relevance and Conditions

Cervicitis (Inflammation of the Cervix)

Cervicitis is an inflammation of the cervix, most commonly caused by bacterial or viral infections such as Chlamydia trachomatis or Neisseria gonorrhoeae. Symptoms may include abnormal discharge, burning, and pelvic discomfort.

Cervical Insufficiency

Cervical insufficiency (also called incompetent cervix) refers to the premature opening of the cervix during pregnancy, increasing the risk of miscarriage or preterm birth. It is diagnosed by ultrasound and may be treated with a cerclage (surgical suturing of the cervix).

Cervical Cancer (Cervical Carcinoma)

Cervical cancer most commonly develops in the transformation zone of the cervix and is strongly associated with persistent infection by human papillomaviruses (HPV). Regular screening tests, including the Pap smear and HPV test, can detect precancerous changes early, allowing timely treatment before cancer develops.

Cervical Polyps

Cervical polyps are benign growths arising from the mucous membrane of the cervical canal. They may cause irregular bleeding and are usually removed in an outpatient procedure.

Examination of the Cervix

The cervix is routinely examined during gynecological check-ups. Common examination methods include:

Pap smear (Papanicolaou test): Cells are collected from the cervix and examined for abnormal changes.
Colposcopy: A magnified visual examination of the cervix using a colposcope to assess the tissue in detail.
HPV test: Detects the presence of human papillomaviruses in a cervical swab.
Ultrasound (sonography): Used to assess cervical length, particularly during pregnancy.

Monitoring the Cervix During Pregnancy

Many pregnant women and those trying to conceive learn to assess their cervix by touch. Changes in position, firmness, and degree of opening can provide clues about ovulation timing or the onset of labor. This method should always be learned in consultation with a midwife or healthcare provider.

References

Cunningham, F. G. et al.: Williams Obstetrics. 25th edition. McGraw-Hill Education, New York 2018.
World Health Organization (WHO): Comprehensive cervical cancer control – A guide to essential practice. 2nd edition. WHO Press, Geneva 2014. Available at: https://www.who.int
Standring, S. (ed.): Gray's Anatomy. 42nd edition. Elsevier, Amsterdam 2021.

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