(Really, our nervous system is trying to be helpful!) Part of this process of automation is that our nervous system starts keeping certain muscles partially contracted all the time-this saves us time and conscious attention in carrying out repetitive actions. Our nervous system notices the postures and movements that we tend to repeat, and it gradually makes these postures and movements automatic so that we don’t have to consciously think about them. Our nervous system learns certain ways of using our muscles based on how we choose to stand and move each and every day. The way that our muscles move, and how much we keep them contracted, is actually learned over time by our nervous system. The movement and level of contraction of our muscles is controlled by our nervous system. Here’s why our muscles become tight when we overuse them:
The muscles in the neck, shoulders, and chest become tight due to both lack of use and instinctive protecting of the injured area. Thoracic outlet syndrome also occurs when people have had an injury like a broken arm and must keep their arm in a sling for a long period of time. Holding a baby for long periods of time.Playing sports such as baseball, swimming, and gymnastics.Spending long periods of time looking downward at a mobile device.Some common causes of thoracic outlet syndrome are: If we engage in activities or adopt habitual postures that involve flexing the head and neck forward, rounding the shoulders and upper back, and rotating the shoulders inward and bringing our arms in toward our body, we can easily develop the patterns of muscular tightness that lead to thoracic outlet syndrome. The muscles of the neck, shoulders, and chest that we discussed in the last section become tight as a result of the way we use our body every day. Why do we develop the chronic muscle tightness that causes thoracic outlet syndrome? If the brachial plexus is compressed at any point along its path, you may feel the symptoms of thoracic outlet syndrome. The lower four cervical nerves and the first thoracic nerve emerge from the spinal cord, pass in between the scalene muscles in the neck, through the thoracic outlet, under the pectoralis minor, into the armpit, and down the arm. The network of nerves that passes through the thoracic outlet is called the brachial plexus. A bundle of nerves and blood vessels passes through the thoracic outlet and provides sensation, motor control, and circulation of blood to the chest, shoulder, arm, and hand. The thoracic outlet is a small space between the clavicle (collarbone) and the first rib (see image below).
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