肩を動かしてみよう

Let's move the shoulder

The joint which moves the most among the joints is shoulder.

What is there around the shoulder?

collarbone、breastbone、twelve ribs, scapula, humerus gather. Let’s see the right-hand side shoulder!

Scapula contacts with collarbones and only gets on on the ribs of the back. It is fixed with surrounding muscles.
Humerus gets intothe hollow a little, and it is the situation that is easy to shift.
And, it will make the various movements possible.

Where is the ligament to connect a bone and a bone? The ligament is shown in yellow.

How many muscles are there around the shoulder ?

There are about 19 muscles.

We are looking from the belly side.

We are looking at from the back side.

How does the arm move? Which muscle does it use?
The mainly used muscle are shown in blue.

We are looking from the right side.	We are looking from the belly side.
		Raise it upwards with the arm attach to the body

Take it to the back with the arm attach to the body

Raise the arm from the body to the right side.

In the animation, we are looking from the back side.

We moved the right arm outward. The muscle used this time is in the back. It is shown in blue

When we bend an arm inward, we use the muscle of the blue.

What is the stiff shoulder?

Stiff shoulder becomes severe when we get old. Why?
The left animation is the one watched the right shoulder from behind

Where does the scapula adhere to?
It has only adhered to the collarbone which is in front. It has only been in 12 bones of the back surrounding a breast.

Where does the humerus adhere to? It only enters in the hollow of the scapula.

The human being of two legs hangs a scapula and a humerus, and is walking.
We catch a humerus and a scapula with the muscles of the back and around the neck not to slide them downward

We cannot support a humerus anda scapula, and the muscles of a neck and the shoulder are getting tired when we keep hand working lowering work and a hand taking down downward.
Stiff shoulder continues when especially our muscles decline.
Exercise to reduce stiff shoulder will be to take an arm at the position that is higher than the height of the shoulder. It will have no effect too much even if we do the exercise of arm in the position that is lower than the height of the shoulder.