Afferent nerves are sensory nerves that carry impulses from the body to the central nervous system.
Efferent nerves are motor nerves that carry impulses from the central nervous system to the muscles and glands.
The peripheral nervous system (PNS) is made of nerves.
According to Comprehensive medical Terminology 3rd Edition by Betty Davis Jones, “A nerve is a cord like bundle of nerve fibers that transmits impulses to and from the brain and spinal cords to other parts of the body.
Astrocytes combined with the walls of a blood capillary, prevent harmful substances from passing from the blood to the brain.
Microglia have branch like processes protruding from their bodies.
A nerve is macroscopic (i.e., able to be seen without the aid of a microscope).
A ganglion is a knot like mass of nerve cell bodies located outside the CNS.” The peripheral nervous system also has afferent and efferent nerves.
The main difference between the somatic and autonomic nervous system is that the somatic nervous system is under voluntary control of the skeletal muscle contractions and the autonomic nervous system operates under involuntary control of the smooth and cardiac muscle as well as glandular activities and secretions.
#3 The two main components of the central nervous system are the spinal cord and the brain.