Eventually, the bronchi become known as bronchioles â the smallest air tubes in the lungs. This system of air tubes can be thought of as an upside down tree, with the trachea being the main trunk and the bronchi and bronchioles being the branches. The medical term for all the air tubes is 'the respiratory tract'.
An injury to the vertebrae or discs in your neck can cause pain, numbness, or weakness in your shoulder, arm, wrist, or hand because the nerves that extend out from between the neck provide sensation and allow for movement in these areas.
Injury. Left arm weakness is often a consequence of some sort of injury. Any time a person breaks a bone in their left arm, wrist, or hand, for instance, he or she may feel fatigue or tingling as the body responds to the trauma. Cuts and lacerations can be causes, too, and even deep bruises can cause temporary weakness. Ad.