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.
Does metal plates and screws in lower leg can cause pins and needles and tingling in the foot. 1 doctor agreed: Usually not: But may be close to a peripheral nerve, and potential of irritation from instrumentation or perhaps scarring. You may have initially injured a nerve, and the tingling is a sign of regeneration.