Group B nerve fiber

Type of nerve fiber

Group B nerve fibers are one of the three classes of nerve fibers in the human body, classified based on their diameter, myelination, and conduction velocity. These fibers are part of the autonomic nervous system and play a crucial role in transmitting autonomic signals.

Characteristics

Group B nerve fibers are characterized by their intermediate diameter and moderate conduction velocity. They are myelinated, which allows for faster signal transmission compared to unmyelinated fibers. The diameter of Group B fibers typically ranges from 1 to 3 micrometers, and their conduction velocity is between 3 to 15 meters per second.

Function

Group B nerve fibers primarily function in the autonomic nervous system, specifically in the sympathetic nervous system and the parasympathetic nervous system. They are involved in transmitting signals from the central nervous system to various organs and tissues, regulating involuntary functions such as heart rate, digestion, and respiratory rate.

Comparison with Other Nerve Fibers

Group B nerve fibers are distinct from Group A nerve fibers and Group C nerve fibers. Group A fibers are larger, myelinated, and have the fastest conduction velocity, primarily involved in motor and sensory functions. Group C fibers are the smallest, unmyelinated, and have the slowest conduction velocity, typically associated with pain and temperature sensations.

Clinical Significance

Damage or dysfunction in Group B nerve fibers can lead to various autonomic disorders. Conditions such as autonomic neuropathy can affect these fibers, leading to symptoms like abnormal heart rate, blood pressure issues, and digestive problems.

Related Pages

• Autonomic nervous system
• Sympathetic nervous system
• Parasympathetic nervous system
• Group A nerve fiber
• Group C nerve fiber
• Autonomic neuropathy