Nuclear bag fiber
Nuclear bag fiber (pronunciation: noo-klee-er bag fahy-ber) is a type of muscle fiber found in intrafusal muscle fibers, specifically in the muscle spindle. It is named for its distinctive appearance, with nuclei clustered in a bag-like formation in the central region of the fiber.
Etymology
The term "nuclear bag fiber" is derived from the appearance of the fiber's central region, which contains a cluster of nuclei that resemble a bag. The term "fiber" refers to the elongated, thread-like structure of the muscle fiber.
Structure and Function
Nuclear bag fibers are larger and shorter than nuclear chain fibers, another type of intrafusal muscle fiber. They are characterized by a central region, or "bag", filled with nuclei. This region is surrounded by contractile muscle tissue.
Nuclear bag fibers play a crucial role in the proprioception system, which is the body's ability to sense its own position, motion, and equilibrium. They are sensitive to both the length and rate of change in length of the muscle, providing the central nervous system with information about muscle stretch and contraction.
Related Terms
- Intrafusal muscle fiber: A type of muscle fiber that acts as a sensory receptor in the muscle spindle.
- Muscle spindle: A sensory receptor located in muscles that senses changes in muscle length and rate of length change.
- Nuclear chain fiber: Another type of intrafusal muscle fiber, smaller and longer than nuclear bag fibers.
- Proprioception: The body's ability to sense its own position, motion, and equilibrium.
See Also
External links
- Medical encyclopedia article on Nuclear bag fiber
- Wikipedia's article - Nuclear bag fiber
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