July 23, 2024

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Anatomy, Function, Size, Position & Conditions

3 min read
Anatomy, Function, Size, Position & Conditions

What does a uterus look like?

Your uterus looks like a light bulb. It’s about the size of your fist. It’s also commonly described as an upside-down pear. Your uterus has two horn-like organs at the top (the fallopian tubes). It connects to your cervix at the bottom, which is the part that opens (dilates) during vaginal delivery.

Your uterus has several sections:

  • Fundus: The uppermost and widest part of your uterus. It connects to your fallopian tubes.
  • Corpus: The main body of your uterus. This is where a fertilized egg implants during pregnancy.
  • Isthmus: The part of your uterus between your corpus and cervix. It’s where your uterus starts to narrow or thin.
  • Cervix: The lowest part of your uterus. Your cervix opens to your vagina.

Where is the uterus in your body?

Your uterus is in your pelvis between your bladder and rectum. It’s supported by your pelvic floor muscles and perineal body. Ligaments in your pelvis, lower back and hips also help hold your uterus in place.

What is your uterus made of?

Your uterus consists of three layers:

  • Perimetrium: The outermost, protective layer.
  • Myometrium: The highly muscular middle layer. This is what expands during pregnancy and contracts to push your baby out.
  • Endometrium: The inner layer or lining of your uterus (uterine lining). This layer of your uterus is shed during your menstrual cycle.

How big is your uterus?

Your uterus is about 3 inches from top to bottom and 2 inches wide at the widest part. It’s about 1 inch thick and weighs around 1 ounce.

How big is your uterus during pregnancy?

Your uterus is one of the most unique organs in your body. It can stretch from the size of a lemon to the size of a watermelon during pregnancy. Your uterus can be up to 2 pounds when your baby is born. Your uterus shrinks down to its normal size (a process called involution) and position about six weeks postpartum (after giving birth).

What are the positions of the uterus?

Your uterus can lie in several positions. A typical uterus tilts forward at your cervix and points towards your abdomen. This is called an anteverted uterus. Most people have an anteverted uterus.

If you don’t have an anteverted uterus, you might have a:

  • Retroverted uterus: Commonly called a tipped or tilted uterus. This is when your uterus is tilted or tipped backward so it curves toward your spine instead of forward toward your abdomen.
  • Anteflexed uterus: Your uterus is anteflexed when it’s bent forward. The tilt is severe and can put pressure on your abdomen or bladder and cause painful symptoms.
  • Retroflexed uterus: Your uterus is retroflexed when it’s bent backward. The tilt puts pressure on your lower back.

Some people never know they have an irregular-shaped uterus because they don’t have symptoms. In some cases, you’ll have symptoms that require treatment by your healthcare provider.

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