A cutaneous nerve contains only afferent (sensory) and postganglionic sympathetic fibers, whereas a muscular nerve contains these two types of fibers as well as efferent (motor) fibers connecting to the skeletal muscles. Thus the cutaneous and muscular nerves differ in fiber composition.
When all other anatomic features are similar, acu-reflex points associated with nerve trunks containing more nerve fibers are more likely to become sensitized than are those with fewer nerve fibers.
The afferent (sensory) fibers provide sensory receptors attached to the blood vessels, muscle fibers, muscle spindles, muscle tendons, and skin. The sensory fibers collect sensory information from all these structures.
The efferent (motor) fibers innervate skeletal muscles and smooth muscles. The postganglionic sympathetic fibers innervate glands in the skin and internal organs. The motor fibers activate muscle contraction, and the sympathetic fibers control the activities of the glands and internal organs.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.