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Journal of Speech and Hearing Research Vol.29 266-269 June 1986.
© American Speech-Language-Hearing Association
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Interdigitating Muscle Fibers Throughout Orbicularis Oris Inferior

Preliminary Observations

Claudia Blair 1
1 University of Wisconsin, Madison

Observations of serial sections from two cadaveric specimens of human lower lip are presented. The complex structure of the muscles of the lower lip region includes several fascicles of fibers that are parallel to the vermilion border and other muscle fibers that interdigitate the parallel structures. Two classes of interdigitating muscle fibers are described: The majority originate inferior to the mucosal-gingival border and have a primarily vertical course. The others originate at the hairy epidermis inferior to the vermilion, course diagonally through the horizontal fibers, and insert near the mucosal-vermilion border.

Submitted on April 11, 1985
Accepted on December 11, 1985


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