Muscle sensors

1. Types of muscle sensors (see Table 2-4)

a. Muscle spindles (groups la and II afferents) are arranged in parallel with extrafusal fibers. They detect both static and dynamic changes in muscle length.

b. Golgi tendon organs (group lb afferents) are arranged in series with extrafusal muscle fibers. They detect muscle tension.

c. Pacinian corpuscles (group II afferents) are distributed throughout muscle. They detect vibration.

d. Free nerve endings (groups III and IV afferents) detect noxious stimuli.

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