Spindles in a muscle a Types of intrafusal fibers in muscle spindles Figure 28 1 Nuclear bag fibers

-detect the rate of change in muscle length (fast, dynamic changes).

- are innervated by group la afferents.

- have nuclei collected in a central "bag" region.

Dynamic Static y-motor fiber y-motor fiber

Group la afferent

Group II afferent

Dynamic Static y-motor fiber y-motor fiber

Group la afferent

Trail ending

Primary ending

Secondary ending

Figure 2-8. Organization of the muscle spindle. (Modified with permission from Matthews PBC: Muscle spindles and their motor control. Physiol Rev 44:232, 1964.)

) Nuclear chain fiber

Nuclear bag fiber

Trail ending

Primary ending

Secondary ending

Figure 2-8. Organization of the muscle spindle. (Modified with permission from Matthews PBC: Muscle spindles and their motor control. Physiol Rev 44:232, 1964.)

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