In my last blog Your boney hollow is misled you, you may not have noticed, I mentioned your shoulder. Some people take umbrage about have an area in your body called the shoulder. I tend to agree however it is in our common language.
If you have an image of your shoulder as being like a doll with moveable arms perhaps you will need to read on.
The area of the shoulder is where the upper arm (humerus) connects to the body via the scapula and via the clavicle to the sternum, there is no skeletal connection on the back.
The range of movement in the arms and hands are huge and also must be strong and stable to allow lifting and pushing heavy objects. To achieve this we have evolved to have a very movable structure that is stable and very strong as well. The muscles on the whole of your back and front of your torso are involved in your arm movement. In fact all your muscles are involved.
Lets experiment, that’s if you feel it’s appropriate to you, move a hand out to the side or in front of you avoid touching anything with your hand. Now imaging your arm is the jib on a crane, just like the one’s used in building very tall buildings. Start lifting a very heavy load that is too heavy for your imaginary crane, now what happens, my crane starts to topple, does yours?
You can put your arm down.
The crane operator has a few options, firstly stop and lower the load, then either reduce the load or strengthen the crane, perhaps adding more counter balance weights and adding heavier load bearing cables would be successful.
We do these adjustments when we lift an arm with or without a load, we adjust muscle tone around our body to counter the effect of falling without even knowing it. This activity is happening continuously, even when I’m sitting writing this blog. Name an activity and this need to be in balance will be paramount in that activity.
I digressed, the shoulder.
I used to think that the shoulder was something a bit nebulas between my neck and upper arm joint, my shoulder blade also had something to do with it as well. Is that similar to your thinking? Add a comment, if you like, and tell me about your shoulders beliefs.
Here’s a bit of anatomy, I’m deliberately brief as you can always do your own research to know more.
Three are three joints from the sternum to the humerus,
The sternoclavicular joint between the clavicle and the sternum.
The acromioclavicular joint between the scapula and clavicle, this joint is at the acromion process of the scapula,
The glenohumeral joint between the humerus and the scapula, this joint is at the glenoid cavity of the scapula.
The scapula, the shoulder blade, is a plate like bone that has many muscle attachments to your back from down to your pelvis and up to the top if you neck, please read Your boney hollow if you want to know where the top of your spine is. There are also muscles attached to the sides of you ribs that move the scapula forward around your ribs. We have a huge range of movement in our scapula so that we can use our hands in activity, without the scapula’s range of movement we would be severely constrained. How about experimenting by moving your scapula to experience the range of movement but don’t strain yourself, be kind to yourself.
You may think that your scapula is all on your back but it isn’t some of it wraps over the top of your ribs.
Put a finger on your sternum and follow along your clavicle, collar bone, until you reach the end of the clavicle at the glenohumeral joint, at the top of this joint is the acromion and just below and slightly to your centre line is the coracoid process, these are both parts of the scapula and at your front.
So what is a shoulder?
Can you tell me!
If you want to know more click here.