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1 Section of Anatomy, Institute of Stomatognathic Science, School of Dentistry, Tokyo Medical and Dental University, Yushima, Tokyo 113, Japan
Histological study of the masticatory muscles of the tree shrew showed that 140 muscle spindles are concentrated in the restricted areas of the inner lowermost layer of the horizontal and vertical portions of the temporal muscle (48 and 47 spindles, respectively), the profundus portion of the masseter muscle (42 spindles), and the zygomaticomandibular muscle (3 spindles). The medial and lateral pterygoid muscles are devoid of spindles.
Submitted on July 13, 1973
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