they're little bits of muscle that release an adhesive molecule so that the bits of muscle stick together and form "knots". usually from bad posture/overuse/that kind of thing. the muscle i think you're talking about is the upper trapezius. it's nothing to worry about, but massages are great for it, albeit a little painful at the time.
No, you can get welts in your head. Knots usually are in the shoulder or back
Knots in the back of the arm can be caused by a number of conditions such as inflammation or infection. To get rid of these, swing the arms back and forth, as well as do some shoulder circles.
deltoids are the back shoulder muscles and trapezoids are the muscles around the shoulder/neck/back area
A 12 year old could have neck shoulder and back pain. He/she could have scoliosis or something else.
There are several simple neck stretches to relieve neck pain and stress. These exercises include neck stretch, shoulder shrugs, and upper back stretch.
the neck is cephalad to the shoulder
The trapezius muscle is a superficial muscle of the neck and upper back that acts at the shoulder. It is responsible for movements like shoulder shrugging, scapular elevation, depression, retraction, and rotation.
deltoids are the back shoulder muscles and trapezoids are the muscles around the shoulder/neck/back area
To strengthen the muscles in the back of your neck, you can do exercises like neck extensions, chin tucks, and shoulder blade squeezes. These exercises help improve neck strength and posture.
The trapezius is an upper back/neck muscle and the deltoids are shoulder muscles
the neck is cephalad to the shoulder
It can be. Heavy breasts can contribute to back, neck and shoulder ache.