Showing posts with label Human Body. Show all posts
Showing posts with label Human Body. Show all posts

Tuesday, October 22, 2019

Fibrous Tunic


We just learned about the Aqueous Humour.

Another part of the eye is the Fibrous Tunic.

We learned before about the clear cornea bubble at the front of the eye, and the white sclera that makes the outside white part of the eye.

These two parts together are called the fibrous tunic.
The word tunic is an old word for clothing that people wore long ago.

Sometimes the words cornea and sclera are smushed together and just called the corneosclera.


(from: wikipedia - fibrous tunic of eyeball)


Kid Facts - Blast from the past: Odontoblast

Tuesday, October 15, 2019

Aqueous Humour


We just learned about the Vitreous Body gel inside the eye.

Another part of the eye is the Aqueous Humour.

We know that the eye has different layers.
1 - On the very outside is the cornea, the clear part of the eye that you can touch with your finger.
2 - Then there is the pupil which is the hole letting light in, and the colored iris that helps control the size of the pupil.
3 - Behind those is the lens, which is like a magnifying glass that changes shape to help you focus.

In between those layers is some watery liquid that helps keep everything tightly held in place.
This is the Aqueous Humour, and you can think of it kind of like how a water balloon helps keeps the shape of the balloon.

Aqueous is because it is watery, and Humour means like a liquid.
So the name really means watery liquid.


(from: wikipedia - aqueous humour)


Kid Facts - Blast from the past: Odontoblast

Tuesday, October 8, 2019

Vitreous Body


We just learned about the Macula in the back of the eye.

Another part of the human eye is the Vitreous Body.

Inside the eye, most of it is filled up with a kind of clear gooey gel.
It's clear like water, but is thicker almost like jelly.

This is called the vitreous body, or sometimes the vitreous humor.
It helps the eye keep its shape, and it helps keep the vision clear between the lens and the retina.


(from: wikipedia - vitreous body)


Kid Facts - Blast from the past: Tooth Root

Tuesday, October 1, 2019

Macula


We just learned about the Sclera whites of the eyes.

Another part of the eye is the Macula.

This is an oval shaped darker spot on the retina in the back of the eye.
The macula helps you see very detailed colors in bright daylight.

If there is a big picture with lots of colors and shapes, your macula helps you see it all clearly.
Sometimes when people get old their macula doesn't work as well anymore, which can cause blurry vision.


(from: wikipedia - macula of retina)


Kid Facts - Blast from the past: Crown

Tuesday, September 24, 2019

Sclera


We just learned about the Optic Nerve that brings the eyes signals back to the brain.

Another part of the eye is the Sclera.

This is the name for the white part of the eye.
It is made up mostly of connective tissues called collagen and elastic fiber.


(from: wikipedia - sclera)


Kid Facts - Blast from the past: Pulp

Tuesday, September 17, 2019

Optic Nerve


We just learned about the Lens in the eye that helps focus light for us to see.

Another part of the eye is the Optic Nerve.

We learned before about the retina in the back of the eye that takes the light from the eye and turns it into signals that the brain can understand.

The retina is connected to a big long nerve called the optic nerve.

This nerve takes the signals from the retina and carries them all the way to the back of the brain, to the part of the brain called the occipital lobe where the signals from the eyes get turned into pictures for the brain to understand.


(from: wikipedia - optic nerve)


Kid Facts - Blast from the past: Cementum

Tuesday, September 10, 2019

Lens


We just learned about the Retina at the back of the eye.

Another part of the eye is the Lens.

This is a part of the eye right behind iris and pupil.
It is clear and works like a magnifying glass to help the eye focus on things close or far away.

The eye has muscles to push and pull on the lens to change the focus.


(from: wikipedia - lens (anatomy))


Kid Facts - Blast from the past: Dentin

Tuesday, September 3, 2019

Retina


We just learned about the Cornea.

Another part of the eye is the Retina.

Remember that the black pupil in the eye is really just a hole for the light to come in.
The black color of the pupil comes from the inside of the eye, where the light hits the retina.

The retina is in the back of the eye.
Inside the eye it is shaped like a ball, with the pupil as the hole to let light in, and the retina as inside of the ball at the back.

The retina helps take the light that shines on it, and turn it into signals that are sent to the brain so you can understand what you are seeing.


(from: wikipedia - retina)


Kid Facts - Blast from the past: Tooth Enamel

Tuesday, August 27, 2019

Cornea


We just learned about how we get different Eye Colors.

Another part of the human eye is the Cornea.

This is the clear bubble that is on the front part of your eye.

It works kind of like a magnifying glass, and helps bring light into the eye so you can see.


(from: wikipedia - cornea)


Kid Facts - Blast from the past: Tooth Impaction

Tuesday, August 20, 2019

Eye Color


We just learned about the Iris that opens and closes the pupil.

Another part of the eye is the Eye Color.

The iris we learned about has two parts in it that help make up the eye color.
One is the stroma, and the other is the IPE, which stands for Iris Pigment Epithelium.

That's a lot of big words, but it basically means a bunch of stringy like parts that can have different colors that all blend together to make up your eye color.

The part the really makes a difference is something called melanin.
This is basically like dark paint that your body makes, and the more if it you make the darker your skin, hair and eyes are.

So someone with black hair, dark brown skin and brown eyes has a lot of melanin.
Someone with blond hair, pale skin and blue eyes, has less melanin.


(from: wikipedia - eye color)


Kid Facts - Blast from the past: Dental Notation - Palmer

Tuesday, August 13, 2019

Iris


We just learned about the Pupil black circle in the eye.

Another part of the eye is the Iris.

The iris is the part of the eye with color.
Most eyes are either brown or blue, but they can be other colors like green, hazel, grey or red.

Remember that the pupil is just a hole that lets light in to the eye to see.
The iris has the muscles that make the pupil bigger or smaller.


(from: wikipedia - iris (anatomy))


Kid Facts - Blast from the past: Dental Notation - ISO

Tuesday, August 6, 2019

Pupil


Let's learn more about the Human Eyes.

One important part of the eye that we see every day is the Pupil.

The pupil is the big black circle in the middle of the eye.
Even though it looks like it is painted black, the pupil is actually just a hole!
There are parts covering the pupil, and parts of the eye behind it.

This hole in your eyeball gets bigger and smaller to let in more or less light depending on how bright it is.

If you go to the eye doctor, they will put liquid drops in your eyes to make your pupils really big, and then they look right through the pupil into the other parts of the eye.


(from: wikipedia - pupil)


Kid Facts - Blast from the past: Dental Notation - Universal Numbering

Tuesday, July 30, 2019

Eyes


We'now learned a whole lot about the mouth, from teeth to tastebuds to Tonsils!

Let's start learning about the human Eyes.

The eyes give people the ability to take in light and turn it into shapes and figures that our brain can understand, and help us see.

Human eyes can see about 10 million colors, they can work together as two eyes to tell how close or far away something is, and can see things from specs of dirt on the ground to stars in the sky millions of miles away.


(from: wikipedia - human eye)


Kid Facts - Blast from the past: Hypodontia

Tuesday, July 23, 2019

Tonsils


We just learned about the Parotid Gland.

Another part of the mouth is the Tonsils.

Usually when people talk about tonsils they mean the two lumps at the back of the throat.
There is one on the left and one on the right.

The big long name for these is the palatine tonsils or faucial tonsils.

There are actually three types of tonsils:
- Palatine tonsils - At the back of the throat
- Tubal tonsils - Behind the throat and almost back by the ear
- Adenoids, also called the pharyngeal tonsil or nasopharyngeal tonsil - Up the back of the throat and behind the nose

These tonsils have special tissues in them that help fight against sickness and germs.


(from: wikipedia - palatine tonsil)



(from: wikipedia - tobal tonsil)



(from: wikipedia - adenoid)


Kid Facts - Blast from the past: Supernumary Teeth

Tuesday, July 16, 2019

Parotid Gland


We just learned about the Labial Commissure of the Mouth where your upper and lower lips meet.

Another part of the mouth is the Parotid Gland.

This is the part of the body that makes saliva or spit and sends it out to the parts of the mouth that need it.


(from: wikipedia - parotid glad)


Kid Facts - Blast from the past: Mouth - Wisdom Tooth

Tuesday, July 9, 2019

Labial Commissure of the Mouth


We just learned about the Frenulum of the Lower Lip.

Another part of the mouth is the Labial Commissure of the Mouth.

This is a big long name that really just means the corner of your mouth where your upper and lower lips meet.

The word labial means lips, and commissure means joining.


(from: wikipedia - labial commissure of mouth)


Kid Facts - Blast from the past: Maxillary Second Molar

Tuesday, July 2, 2019

Frenulum of Lower Lip


We just learned about the White Roll at the top of the upper lip.

Another part of the mouth is the Frenulum of Lower Lip.

We learned before about the little piece of skin under the tongue called the frenulum.
It is not the only thing called a frenulum in the body though!

Another frenulum is down at the bottom middle of the inside of the lower lip, right where it meets the gums.
If you put your tongue down there you can usually feel a little piece of skin there.


(from: wikipedia - frenulum of lower lip)


Kid Facts - Blast from the past: Maxillary First Molar

Tuesday, June 25, 2019

White Roll


We just learned about the bumpy spot on the upper lip called the Philtrum.

Another part of the mouth is the White Roll.

Right above where the lip changes from pink to normal skin color, there is a line where it is lighter than the rest of the skin on the face.
For a light skinned person this is almost white, so it is called the white roll.
For a dark skinned person it won't be white, but it will be lighter than the rest of the skin on the face.

The white roll shows up more for young people, and as people get older it gets less white and sticks out less.
Sometimes people will go get plastic surgery to make it stick out more to make themselves look young again.


(from: wikipedia - white roll)


Kid Facts - Blast from the past: Maxillary Second Preomlar

Tuesday, June 18, 2019

Philtrum


We just learned about the Vermillion Border no the top of the lip.

Another part of the mouth is the Philtrum.

The philtrum is on the outside of the upper lip, right in the middle, going from the nose to the lip.

For most people this is a little indent or groove.
Some scientists think that this part of the lip used to be used to try and help guide smells up to the nose, back when we used to have to hunt or smell our food more to see if it was ok to eat.


(from: wikipedia - philtrum)


Kid Facts - Blast from the past: Maxillary First Premolar

Tuesday, June 11, 2019

Vermillion Border


We just learned about the line of the top of the lips called the Cupid's Bow.

Another part of the lip is the Vermillion Border.

Vermillion is actually a word that means red.
The vermillion border is the place where the lip skin changes from pink or red to the color of the rest of the face.

(from: wikipedia - vermillion Border)


Kid Facts - Blast from the past: Maxillary Canine