The correct answer is option 4: Smooth muscles. Nerves are specialized cells known as neurons that transmit signals throughout the body. They are composed of different components, but smooth muscles are not one of them.

Option 1: Axons are part of nerves. They are the long, slender projections of neurons that transmit electrical signals from the cell body to other neurons or target cells.

Option 2: Connective tissues are also found in nerves. They provide support and protection to the nerve fibers.

Option 3: Schwann cells are a type of glial cell that wraps around the axons of neurons, providing insulation and support. They are essential for the proper functioning of nerves.

Option 4: Smooth muscles, on the other hand, are not directly associated with nerves. Smooth muscles are a type of involuntary muscles found in organs such as the intestines, blood vessels, and bladder. They are controlled by the autonomic nervous system but are not considered a part of nerves.

In conclusion, smooth muscles are not a part of nerves, making option 4 the correct answer.