[libribook.com] Traumatic Scar Tissue Management 1st Edition

PNS
The primary structures of the PNS include Schwann cells, peripheral nerves and
neural pathways (Fig. 4.5). Functionally, the PNS is divided into the somatic NS,
which controls voluntary activity, and the autonomic NS, which controls
involuntary activity – covered in greater detail later in this chapter.
Schwann Cells
Schwann cells, the principle glial cells of the PNS, produce myelin which
surrounds axons and assists with conductivity.
Peripheral Nerves
Nerves are commonly classified into categories based on the presence or absence
of myelin (e.g. myelinated and non-myelinated fibers), composition or function
(sensory, motor and mixed/associated) and origin (cranial or spinal) (Fig. 4.6).