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Female Reproductive System: Internal Anatomy

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  1. 0:05 Female Reproductive Tract
  2. 1:06 Ovaries
  3. 2:23 Uterine Tubes
  4. 4:54 Uterus and Cervix
  5. 6:27 Vagina
  6. 7:19 Lesson Summary
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Taught by

Heather Adewale

Heather has taught reproductive biology and has researched neuro, repro and endocrinology. She has a PhD in Zoology/Biology.

Ever wonder where a female produces her eggs or how they get from the ovary to the uterus? Find out in this lesson about the internal reproductive anatomy of females.

Female Reproductive Tract

Parts of the female reproductive tract
Female Reproductive Tract

Ahhh, the secrets of women - what guy hasn't wondered about that? Well, we aren't quite ready to reveal the mystery of a woman's heart; those are something all her own. You could take a course on sex differences of the brain - that might help you learn how women think, but we can't promise anything. What we can do is give you a glimpse of what's inside her. You know what they say; 'beauty is what's on the inside,' right? And on the inside, all women have the same reproductive structures.

So, while not as interesting as the mysteries of the mind, the mysteries of the female reproductive tract include a couple key structures:

  • The ovaries, which produce the next generation
  • The uterine tubes, which transport the next generation
  • The uterus, which grows the next generation

Hmmm, see a pattern developing here? Let's not forget the cervix and the vagina, the doorways to the rest of the reproductive tract.

Ovaries

First up are the ovaries. These are small, about the size of a walnut with a lumpy appearance, and are usually off-white or yellowish in color. They are located near the walls of your pelvic cavity (that's the cavity down where your hips are), and, similar to the testes, are protected by a layer of connective tissue called the tunica albuginea. If you've learned about the testes already, you may remember that this is the same name used to refer to the connective tissue layer that covers each testicle.

Thousands of eggs are within the ovary
Ovary Egg Diagram

Now, these tiny little structures are quite important for the future of the human race. You see, the inside of the ovary houses lots and lots of egg nests. No, not like a bird's nest, more like a nest made of cells and tissue. Each month, one of these thousands of eggs is recruited from the nest to begin its journey to become an oocyte. The nests form and the journey takes place in a specific part of the ovary called the cortex.

The cortex is located along the sides of the ovary, and it's where oocyte production occurs. In addition to the cortex, the ovary also has an area called the medulla, which is located in the center of the cortex, and that's where the arteries and veins of the ovary are found.

Uterine Tubes

Okay, so now that we know why females have ovaries and what they do, let's go back to our recruited oocyte for a bit. Once the oocyte leaves the nest and has traveled through the cortex, it is ready to graduate onto its next potential pathway in life: the possibility of meeting a sperm and growing into a baby. To do this, it has to have a way to get there, right?

That's the job of our next structure. When the oocyte is released from the ovary, it is caught by the uterine tubes. These are hollow, muscular tubes whose job is to transport the oocyte from the ovary to the uterus. If you look closely, you will see that their structure changes from one end to the other. That is because they are divided into three different parts.

  1. The infundibulum is the expanded, funnel-shaped portion closest to the ovary. See those fingerlike projections? They contain a bunch of little tiny cilia that beat quickly, catching the oocyte as it is released from the ovary and pushing it towards the middle of the uterine tube, the portion called the ampulla.
  2. The ampulla is located in between the infundibulum and the isthmus. The smooth muscle layers here help push the oocyte down the tube towards the uterus.
  3. The isthmus is the portion closest to the uterus and connects the uterine tube to the uterine wall.

The cilia and the smooth muscles work together to transport the oocyte through the tube and towards the uterus. This is a process known as peristalsis , the wavelike movement of smooth muscle contractions often used to move objects.

Parts of the uterine tube
Uterine Tubes Diagram

Now, if the egg is going to meet up with sperm from the male, it usually happens along this pathway at the boundary between the ampulla and the isthmus. So the oocyte depends on peristalsis for transportation - transportation to increase its chances of meeting up with the male's sperm so that fertilization can occur, and then transportation to the uterus, where it will develop into a baby.

However, while the purpose of oocyte release and transport is for reproduction, most of the time fertilization does not occur, and in these cases the oocyte will simply degenerate as it reaches the end of the uterine tube.

Uterus and Cervix

Next stop: the uterus. That's the big structure in the middle. This is where the magic of life takes place, where that tiny little fertilized oocyte develops into a baby!

You see, each of the uterine tubes connects to the uterus, one on each side. Once an oocyte is fertilized it travels to the uterus because the uterus is the site of oocyte implantation. Once implanted, the uterus protects and nourishes the fertilized oocyte, which is now called an embryo.

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