Understanding your anatomy
Your cervix connects your uterus to your vagina.
This small part of the reproductive system plays a role in menstruation, conception, pregnancy, and childbirth. It is also the area checked during cervical screening.
Learn where the cervix is, what it does, and which symptoms deserve a conversation with your OB-GYN.
About your OB-GYN
Dr. Jessica White-Videa, DO, FACOG
Dr. White-Videa is a board-certified obstetrician and gynecologist and Fellow of the American College of Obstetricians and Gynecologists. She provides preventive gynecology, cervical screening, prenatal care, and evaluation of symptoms at Ideal Women's Healthcare in Coral Springs.
Where is the cervix located?
The cervix sits at the lower end of the uterus and projects into the upper vagina. It is part of the uterus, rather than a separate organ. [1]
The vagina is the muscular canal leading from the vaginal opening toward the cervix. The vulva is the external genital area. These structures have different names and functions.
Anatomy guide
Cervix illustration: the main parts explained
The main diagram shows the cervix below the uterus and above the vagina. The definitions below explain its openings and canal.
- Internal os: The opening toward the uterine cavity.
- Endocervical canal: The passage through the cervix.
- External os: The opening from the cervix into the vagina.
- Ectocervix: The outer cervical surface visible during a speculum exam.
Columnar cells line the endocervical canal, while squamous cells cover the ectocervix. Their meeting point is called the squamocolumnar junction.
The transformation zone is the region between the original and current squamocolumnar junctions. It is important in cervical screening because many precancerous changes develop there. [2]
What it does
What is the function of the cervix?
Menstruation
Menstrual blood passes from the uterus through the cervical canal and into the vagina.
Conception
Sperm can pass through the cervical canal. Cervical mucus changes during the cycle and affects how easily sperm move through it.
Pregnancy
The cervix normally remains closed during most of pregnancy, helping support the pregnancy.
Childbirth
During labor, the cervix thins and opens to allow the baby to pass into the vagina.
Learn more about the cervix's reproductive functions. [3]
How does the cervix change during your menstrual cycle?
Hormonal changes affect cervical mucus. Around ovulation, mucus may become clearer, wetter, and more slippery. At other times, it may be thicker or less noticeable.
Cervical position and how it feels can also vary. These changes cannot reliably confirm pregnancy or diagnose a cervical condition.
Can cervical mucus tell you if you are pregnant?
No. Discharge changes can have several explanations. If pregnancy is possible, use a pregnancy test rather than relying on mucus or cervical position.
Read our guide to Pap smears and pregnancy testing .
Pregnancy and birth
What happens to the cervix during pregnancy?
During most of pregnancy, the cervix remains closed. As labor approaches and progresses, it softens, thins, and opens. Thinning is called effacement, and opening is called dilation.
Your maternity care team interprets cervical changes alongside contractions, your pregnancy stage, and other findings. A cervical examination alone cannot predict exactly when birth will happen.
Do not try to check cervical dilation yourself. Contact your maternity care team about contractions, bleeding, leaking fluid, or other pregnancy concerns.
For later pregnancy preparation, read when the third trimester starts .
What conditions can affect the cervix?
Cervical symptoms can have several causes. An examination and appropriate testing help determine what is happening.
- Cervicitis: Inflammation of the cervix, which may be associated with infection or other causes.
- Cervical polyps: Growths on the cervix that may cause bleeding and should be evaluated.
- Cervical cell changes: Abnormal cells found through screening may need monitoring or further evaluation.
- Cervical cancer: Cancer that begins in the cervix. Persistent infection with certain high-risk HPV types is the main cause.
An abnormal screening result does not automatically mean cancer. [4]
Preventive care
How do Pap and HPV tests check cervical health?
Pap test
A Pap test examines cervical cells for abnormal changes, including precancerous changes.
HPV test
An HPV test checks for high-risk HPV types that can cause cervical cell changes.
The recommended test and interval depend on your age, previous results, medical history, and current screening guidance. Some patients need a different schedule. [5]
Screening is not a substitute for evaluating symptoms. Contact your provider about unusual bleeding or discharge even if your last screening result was normal.
Can cervical changes occur without symptoms?
Yes. Cervical precancer often causes no symptoms. Staying current with recommended screening matters even when you feel well. [5]
When to seek care
Which symptoms should you discuss with an OB-GYN?
- Bleeding after sex.
- Bleeding between periods.
- Any bleeding after menopause.
- Persistent or unusual vaginal discharge.
- Pelvic pain or pain during sex.
These symptoms can have many causes and do not automatically mean cervical cancer. They still deserve assessment. [6]
Seek urgent medical care for severe pelvic pain, heavy bleeding, fainting, or fever with pelvic pain. Call 911 for a life-threatening emergency.
How can you support cervical health?
- Follow the screening schedule recommended for you.
- Complete follow-up after an abnormal Pap or HPV result.
- Ask whether HPV vaccination is recommended for you.
- Discuss STI testing based on symptoms and exposure history.
- Report new bleeding, discharge, or pelvic symptoms.
HPV vaccination does not replace cervical screening. Your clinician can help you understand both.
Cervical health care in Coral Springs
Ideal Women's Healthcare provides preventive gynecology, cervical screening, and evaluation of bleeding, discharge, and pelvic concerns.
2855 N. University Drive, Suite 300
Coral Springs, FL 33065
(954) 317-0772
Learn about gynecology care or request an appointment.
Frequently asked questions about the cervix
Is the cervix part of the uterus?
Yes. It is the lower, narrow part of the uterus that opens into the vagina.
Is the cervix the same as the vagina?
No. The vagina is the canal leading toward the cervix. The cervix forms the lower part of the uterus.
What is the difference between the internal and external os?
The internal os is the opening toward the uterine cavity. The external os is the opening into the vagina.
Can feeling your cervix confirm pregnancy?
No. Cervical position or texture cannot reliably confirm pregnancy. Use a pregnancy test and contact your provider when needed.
Does an abnormal Pap result mean cancer?
No. It means changes were found that may need follow-up. Your provider uses the specific result and your history to recommend next steps.
Should I seek care for bleeding after sex?
Yes. Bleeding after sex has several possible causes and should be evaluated, particularly if it recurs.
Do I need screening if I feel well?
You may. Cervical precancer often has no symptoms. Follow the schedule recommended for your age and health history.
Questions about cervical health?
Talk with your OB-GYN
Get help understanding screening, symptoms, and the next steps that fit your health history.
Request a gynecology appointmentFor urgent symptoms, seek immediate medical assessment. Appointment request forms are not monitored for emergencies.
Medical sources
- National Cancer Institute: Cervix Definition and Anatomy
- IARC: Anatomy of the Uterine Cervix and Transformation Zone
- Canadian Cancer Society: The Cervix
- National Cancer Institute: What Is Cervical Cancer?
- CDC: Screening for Cervical Cancer
- National Cancer Institute: Cervical Cancer Symptoms
Floral artwork is decorative. The educational illustration is simplified; refer to the linked medical sources for detailed anatomy.
This article provides general education. Your clinician can recommend screening and care based on your symptoms and medical history.
