Name: なぜ男性には乳首があるのか？ (Why Do Men Have Nipples?)
Uploaded: 2021-01-14T05:37:15.000Z
Duration: 2 min 51 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

Dnews audience member, Stephan, wants to know, "Why do men have nipples?"

Hey friends, Laci Green here with a very important topic,

In the womb, a sperm meets the egg and a zygote is formed.

All your genetic information is tightly packed into 23 pairs of chromosomes.

There are other sex chromosome pairings like

provide the genetic blueprints to make a human being.

Information about how to form your feet, and your heart, and your eyes, and

In the third or fourth week, you're a little embryo, chilling in the womb,

and that's when the nipples begin to develop.

It starts with the milk line, which runs from your armpit

down through your breasts to your genitals.

Typically only two nipples are arranged on the milk line,

but as many as seven can line up and come hang out.

For most people, these don't develop any further,

but sometimes they do and people are born with more than two nipples.

You can also have little remnants that looks like moles, but they're actually

Now not only do you get nipples but also get milk ducts.

At this point, everyone's looking pretty female. That is until

the eighth week when the hormones start pumping.

For males testosterone mean the penis starts to develop out from the clitoris. The

Things like where you'll get body hair, and how deep your voice will be is determined.

You already have nipples and milk ducts, but the hormones determine if you'll develop more

This happens much later though during the next hormonal uproar in your lifetime,

So if males do have nipples and mammary glands,

Aha! Yes they could, but they're missing the proper hormones to do so.

Hormone are the law of the land. No hormones means no milk.

Sometimes on rare occasions, males will spontanesouly produce milk later in life.

which is a pretty epic name to be honest.

Sometimes that happens in infants too, right after they're born.

When doctors can figure out the cause, it's usually a hormonal thing:

extra prolactin, which is the milk producing hormone.

But a nice chunk of cases, scientists don't know why.

It's just one of those cool nature things that remind you,

sex isn't quite as clear cut as it seems to be.

Do you have a question for me, Anthony, or Trace?

You should leave it in the comments down below and hey, maybe we'll make a video for you.

Don't forget to subscribe for more Dnews updates, and we'll catch you next time!