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.
Peripheral Neuropathy. In some people, leg and foot (and sometimes arm and hand) pain can be the result of neuropathy, a disorder of the peripheral motor, sensory and autonomic nerves that connect the spinal cord to our muscles, skin and internal organs. Neuropathy can cause numbness, tingling and a heavy sensation. âIt usually starts in the feet and may cause a burning sensation in the legs,â Fesperman says. In some cases, people may lose their ability to feel sensation in their legs, which can put them at risk for injury and infection.