Born

The human figure is made with a bone.

 
 
 
 
 
 
 
 
 

It is the state that cut the bone of the head in the middle and open the cover.



The bottom is the nose side and we look at the inside of the head from the top.


    The bottom is the backside of the head.
 
 

The hole which the fascicle of the nerve to feel light runs.

 

The hole which the spinal cord goes along

 

Important brain is settled here.

 
          The hole of an ear
In the days of a baby, it seems that the bone is soft and the bone which should be one of them is seen as divided into two or three. Approximately 350 bones of the baby take long time and are connected to be one, and they become 206 bones in an adult.
The smallest bone in our body is a stirrup bone of approximately 3mm in length that there is in an ear. The biggest bone is a femur, i.e., the bone of the thigh extended from the waist.
From the left, it is a malleus, an ambos, a stirrup bone.
It is the malleus to stick to the eardrum.

A malleus touches an ambos and the ambos touches the stirrup bone.
Eardrum shakes with the vibration of the sound like a drum
This quiver propagates to three bones, and the sound turns into an electrical signal in the depths of the ear. Brain feels this as a sound.

The feature of a child's bone

The stomach side The back side When born, they are bent back as a whole.
In 3-4 months after birth, the cervical spine, that is the bone around the neck bends in front.

The posture that raises a neck on the stomach is possible.

When a baby can sit down a lumbar spine, i.e., the bone of the waist, begins to bend in front, and
when a baby stands up in 12-13 months, the bone of the waist bends in front completely.
Growth condition of height (in the case of a certain boy)

年齢:age

The reason why the bone grows
As a picture below, the bone grows from the part with the cartilage called the epiphyseal line which looks transparent in a streak.
Approximately 6cm for one year till 10 years old
Approximately 8cm for one year till 10-12 years old
Approximately 10cm for one year till 12-14 years old

The growth of height stops at the age of 16-18.


:epiphyseal plate

Like a picture above, when we become an adult, epiphyseal line disappears.

Since the epiphyseal line (growth line of the bone) is dynamically weaker than a bone and ligament, a tendon, it is damaged in slight external force (injury) easily.

 

Muscle

There are two kinds of muscle. It is a voluntary muscle and an involuntary muscle.

A voluntary muscle is the muscular group which is active to advance to the right when, for example, we are going to advance to the right with a will of our own.
An involuntary muscle is a muscular group which does not move by own will, and is governed by autonomic nerves.
For example, they are muscles, such as the heart, the stomach, a small intestine, and the large intestine
The animation below expresses the muscles of the front adhering to a knee.
Tendon

The part which muscles are extended and adheres to a bone is called tendon.
In the figure above, it is the part which red muscles are white. The power of the muscles which expand and contract gets across to a bone through a tendon.

What is a ligament?


If the muscles adhering to a bone move, a bone will also move together.
If we move intensely, the displacement of the bone occurs a little by little.
This is a ligament.
When joint is twisted, the ligament is twisted too. When a twist returns, the power that ligament returns to the original place is related mainly.