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 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.
|
|
|
|
|