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.
Leg weakness can occur as part of a generalized feeling of weakness all over your body, or it may develop in one or both legs. True weakness occurs when the muscles lose their strength, but people often perceive that their muscles are weak when they feel ill or tired. In these cases there is not a true loss of muscle function. The sudden onset of muscle weakness can be a sign of stroke, a potentially life-threatening condition in which part of the brain is deprived of oxygen. This article focuses on conditions that cause a true loss of strength in the leg muscles. Among the most common causes for leg weakness is sciatica, problems with the spinal cord that lead to pinching or compression of the nerves as they exit the spinal cord through the holes between the vertebrae of the backbone.