In this video, we're going to be talking about the uterus. So the uterus is a hollow thick-walled muscular organ in the pelvic cavity of females and its purpose is to receive, retain, and nourish a fertilized ovum or a mature egg. So we're just going to move on down to this image and start labeling parts of the uterus, and we're going to begin over here talking about, kind of, the major portions of uterine anatomy. So we're going to begin with the uterine body. And the uterine body is really just the major portion of the uterus.

It's just the vast majority of this organ is going to be referred to as the uterine body. Right below that, we have the isthmus of the uterus. And just like we saw in our last video, isthmus here refers to a narrowing region. So this is a narrow region of the uterus between the body and the cervix, so that is what that refers to here. And then finally, we have the cervix, which is sometimes called, like, the neck of the uterus.

So that is located right here, and it basically projects into the vagina. So this is the structure that separates the uterus from the vagina, basically. So that's kind of the major breakdown, of the anatomical sections of the uterus. Now moving up here, we have the fundus of the uterus. So this is a rounded region or the upper kind of rounded region that is superior to the entrance of the uterine tube.

So the entrance of the uterine tube would be right here, and this region is directly superior or above that and, as we mentioned, the uterus is a hollow organ, so it has a lumen and lumen, like we always see in anatomy, just refers to, like, a cavity. So the lumen is just the hollow or empty cavity within the uterus. Alright. So now kind of scooching down to talk more about the anatomy of the cervix. So first up, we have this opening right here, which opens up basically from the cervix into the uterus, and that is known as the internal os.

And I know that os is kind of a weird word. We usually think of bones when we hear os, so we think of, like, osteology or osteoporosis. But in gynecology, specifically, os refers to an opening. So the internal os is just the opening between the cervix and the uterus. And then I'm gonna just jump down to this one over here because this is the external os.

So the external os is just the opening between the cervix and the vagina. So we have our internal and our external os or the internal and external openings basically of the cervix. And then right in the middle of those, we have the cervical canal which is the actual cavity of the cervix. And the cervical canal is going to create a very thick mucus that basically plugs the external os and that prevents bacteria from entering the uterus during most times of the menstrual cycle. That mucus will thin out quite a bit when ovulation is taking place to allow sperm to enter the uterus, but for the majority of the month, the uterus would be pretty protected from bacteria thanks to that nice thick mucus plugging up the external os.

Alright. So that is the anatomy of the uterus, and I will see you guys in the next one. Bye bye.