The trachea bifurcates, or divides, into two branches at its most distal portion and forms the bronchi. The bifurcation is reinforced by a cartilaginous plate called the carina. Like the trachea, each bronchus is made up of cartilaginous rings to keep the lumen open as it goes into the lung. As the branches get smaller, they are called secondary bronchi and segmental (or tertiary) bronchi.
Pins and Needles - Paraesthesia. The most common cause of pins and needles is a moderately pinched nerve. Pins and needles is referred to as paraesthesia in the medical community. Did you know that feeling pins and needles can actually be a worse sign than having pain in your arm or leg.
Besides neuropathy, infections and inflammation of the feet can also cause a burning sensation. The most common of these is athlete's foot, an infection of the skin caused by fungus. Peripheral artery disease (PAD) also commonly causes burning feet. The poor circulation of blood to the feet may frequently cause pain, tingling, and burning feet, especially while walking. Weeks or months after gastric bypass surgery, some people experience a burning feet sensation. Poor absorption of B vitamins after gastric bypass can cause neuropathy in the legs and a sensation of burning feet.