Postnatal Development of Muscle Spindles and Extrafusal Muscle Fibers in the Mouse Temporal Muscle and Dietary Effect

In 1985, Maeda et al. found that the formation of annulospiral endings in the masseter muscle of developing mice continued after weaning and was completed by the 50th postnatal day. Moreover, Maeda et al. (1987) reported that a long-term intake of a fine-grained diet resulted in degeneration of annulospiral endings of muscle spindles in the masseter muscle of mice.