Which of the following is NOT a part of a needle?

The term "canula" is often mistaken for "cannula," which refers to a thin tube that can be inserted into the body. In the context of needles, the components that are typically recognized include the bevel, which is the pointed end that allows for easy penetration of the skin; the hub, which connects the needle to a syringe or IV line; and the shaft, which is the length of the needle that houses the cannula. These components work together to ensure the needle functions correctly and effectively for injections, blood draws, or other medical procedures.

The bevel, hub, and shaft are essential parts of a needle’s structure, while "canula" does not describe a part of a needle itself, making it the correct choice for what is not part of a needle.