nerve
In Italian, the word 'nervo' is used to refer to a nerve in the human body. It is a bundle of fibers that transmit signals between the brain and other parts of the body. The term can also be used metaphorically to refer to someone who is 'nervous' or 'on edge'.
The sciatic nerve is the longest in the body.
This sentence is used to express a scientific fact about human anatomy, specifically about the sciatic nerve which is indeed the longest nerve in the body.
I'm losing my nerve due to lack of sleep.
In this context, 'nervo' is used to describe one's patience or composure. The expression 'perdere il nervo' can be directly translated as 'losing the nerve' and is often used when someone is losing patience or getting frustrated.
The dentist hit a nerve while drilling.
This sentence describes a situation that can occur during a dental procedure. If the dentist drills too deep or in the wrong place, they may touch a nerve in the tooth, causing a sharp pain.