Group A nerve fiber
Group A nerve fiber
Group A nerve fibers (pronunciation: /ɡruːp eɪ nɜːrv faɪbər/) are one of the primary types of nerve fibers in the human body. They are myelinated, meaning they are covered by a layer of myelin, which allows for faster transmission of nerve impulses.
Etymology
The term "Group A nerve fiber" is derived from the classification system developed by Erlanger and Gasser in the 1940s. The "A" in Group A refers to the fact that these fibers are myelinated, which is indicated by the letter "A" in the Erlanger-Gasser classification.
Types
Group A nerve fibers are further divided into four subcategories: Aα, Aβ, Aγ, and Aδ. Each of these subcategories has different characteristics and functions:
- Aα fibers are the largest and fastest conducting fibers, primarily responsible for motor functions and proprioception.
- Aβ fibers are slightly smaller and slower than Aα fibers, and are involved in touch and pressure sensation.
- Aγ fibers are involved in the regulation of muscle tone.
- Aδ fibers are the smallest and slowest conducting fibers in Group A, and are involved in pain and temperature sensation.
Related Terms
- Myelin is a fatty substance that covers the axons of many nerve fibers, including Group A fibers, and allows for faster transmission of nerve impulses.
- Proprioception is the sense of the relative position of one's own parts of the body and strength of effort being employed in movement.
- Nociception is the sensory nervous system's response to certain harmful or potentially harmful stimuli.
External links
- Medical encyclopedia article on Group A nerve fiber
- Wikipedia's article - Group A nerve fiber
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