Which one of the following is not a part of nerves ?

A peripheral nerve is a complex structure primarily composed of nerve fibers, which consist of axons and their associated Schwann cells [3]. These fibers are organized into bundles called fascicles, supported by three distinct layers of connective tissue: the endoneurium (surrounding individual axons), the perineurium (enclosing fascicles), and the epineurium (the outermost sheath) [3]. Schwann cells are essential for providing structural support and forming the myelin sheath around axons in the peripheral nervous system. While nerves often innervate smooth muscles to control involuntary functions, smooth muscle tissue itself is not a structural component of the nerve. Smooth muscle is a separate tissue type found in organ systems like the digestive tract and blood vessels, specialized for contraction rather than the conduction of electrical impulses. Therefore, smooth muscles are not a part of nerves.

Sources

1. [3] https://www.ncbi.nlm.nih.gov/books/NBK526125/