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  2. Muscle spindle - Wikipedia

    en.wikipedia.org/wiki/Muscle_spindle

    Muscle spindles are fusiform (spindle-shaped), and the specialized fibers that make up the muscle spindle are called intrafusal muscle fibers. The regular muscle fibers outside of the spindle are called extrafusal muscle fibers. Muscle spindles have a capsule of connective tissue, and run parallel to the extrafusal muscle fibers unlike Golgi ...

  3. Type Ia sensory fiber - Wikipedia

    en.wikipedia.org/wiki/Type_Ia_sensory_fiber

    A muscle spindle, with γ motor and Ia sensory fibers. A type Ia sensory fiber, or a primary afferent fiber, is a type of afferent nerve fiber. [1] It is the sensory fiber of a stretch receptor called the muscle spindle found in muscles, which constantly monitors the rate at which a muscle stretch changes.

  4. Stretch reflex - Wikipedia

    en.wikipedia.org/wiki/Stretch_reflex

    The stretch reflex is accomplished through several different structures. In the muscle, there are muscle spindles, whose intrafusal muscle fibers lie parallel to the muscle and sense changes in length and velocity. The afferent sensory neuron is the structure that carries the signal from the muscle to the spinal cord.

  5. Stretch receptor - Wikipedia

    en.wikipedia.org/wiki/Stretch_receptor

    Muscle spindle, sensory receptors within the belly of a muscle, which primarily detect changes in the length of this muscle; Pulmonary stretch receptors, mechanoreceptors found in the lungs; Chordotonal organ, in insects

  6. Intrafusal muscle fiber - Wikipedia

    en.wikipedia.org/wiki/Intrafusal_muscle_fiber

    Intrafusal muscle fibers are skeletal muscle fibers that serve as specialized sensory organs (proprioceptors). [ 1 ] [ 2 ] They detect the amount and rate of change in length of a muscle . [ 1 ] They constitute the muscle spindle , [ 2 ] and are innervated by both sensory (afferent) and motor (efferent) fibers.

  7. Patellar reflex - Wikipedia

    en.wikipedia.org/wiki/Patellar_reflex

    Striking of the patellar tendon with a reflex hammer just below the patella stretches the muscle spindle in the quadriceps muscle. [2] [3] This produces a signal which travels back to the spinal cord and synapses (without interneurons) at the level of L3 or L4 in the spinal cord, completely independent of higher centres. [4]

  8. Proprioception and motor control - Wikipedia

    en.wikipedia.org/wiki/Proprioception_and_Motor...

    Spindles are conventionally thought of as encoding muscle length, velocity, and acceleration, however there is evidence to suggest that they respond to the force and yank (the first time-derivative of force) exerted on intrafusal muscle. Spindles are also composed of bag- and chain-type fibers, with dynamic and static stretch responses ...

  9. Proprioception - Wikipedia

    en.wikipedia.org/wiki/Proprioception

    Primary endings of muscle spindles "respond to the size of a muscle length change and its speed" and "contribute both to the sense of limb position and movement". [72] Secondary endings of muscle spindles detect changes in muscle length, and thus supply information regarding only the sense of position. [72]