Number of Golgi tendon organs per 100 muscle fibres
**Core Concept**
Golgi tendon organs (GTOs) are proprioceptive sensory receptors located at the junction of skeletal muscle and tendon, responsible for detecting changes in muscle tension. They play a crucial role in the regulation of muscle tone and reflexive responses to muscle stretch or contraction.
**Why the Correct Answer is Right**
GTOs are innervated by Ib afferent fibers, which are sensitive to high-frequency muscle spindle activity and muscle tension. Each GTO is innervated by a single afferent fiber, and they are typically found in groups, with one GTO per 10-15 muscle fibers. This arrangement allows for precise detection of changes in muscle tension and contributes to the regulation of muscle tone.
**Why Each Wrong Option is Incorrect**
**Option A:** This answer is incorrect because the actual number of Golgi tendon organs per 100 muscle fibers is lower than suggested.
**Option B:** This answer is incorrect because the ratio of Golgi tendon organs to muscle fibers is not as high as implied.
**Option C:** This answer is incorrect because the actual number of Golgi tendon organs per 100 muscle fibers is not as low as suggested.
**Option D:** This answer is incorrect because it does not accurately reflect the established ratio of Golgi tendon organs to muscle fibers.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that Golgi tendon organs contribute to the regulation of muscle tone and reflexive responses to muscle stretch or contraction, and their dysfunction can lead to altered muscle function and proprioception.
**Correct Answer: B. 7-10**