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KMID : 0361020010440060633
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Korean Journal of Otolaryngology - Head and Neck Surgery
2001 Volume.44 No. 6 p.633 ~ p.639
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Histochemical Study of Musculature of the Human UpperEsophageal Sphincter
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모지훈/Ji Hun Mo
박민현/정영호/성원진/이동욱/김광현/성명훈/Min Hyun Park/Young Ho Jung/Weon Jin Seong/Dong Wok Lee/Kwang Hyun Kim/Mung Whun Sung
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Abstract
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Background and Objectives: Pharyngoesophageal musculature plays an important role in swallowing, and prevents aspiration and supraesophageal reflux. These muscles are closed during the resting state and opens with swallowing to allow the passage
of
food. In this study, the histochemical characteristics of the upper esophageal sphincter muscles in human were investigated. Materials and Methods: Muscle samples from the inferior pharyngeal constrictor, cricopharyngeus, upper esophageal muscle
and
sternocleidomastoid (SCM) muscle were obtained from the healthy portion of nine laryngectomized specimen. We used the H&E staining for identifying the gross anatomy of these muscles, and the myofibrillar ATPase staining and the NADH-TR staining
for
differentiating the muscle fiber type. Results: Analysis of the muscle fiber types of the upper esophageal sphincter muscle revealed a predominance of type I in the cricopharyngeus (78.9%) and the upper esophageal muscle (85.2%), and type II in
the
inferior pharyngeal constrictor muscle (80%). In the SCM muscle, the percentage of each fiber type was almost the same. The proportion of oxidative fibers within these muscles correlated well to that of the type I fibers. Conclusion: The
distribution of
the type I fibers tended to be higher in the upper esophageal muscle than in the inferior pharyngeal constrictor. These findings about fiber types represents well the physiological features of each muscle, i.e. the inferior pharyngeal
constrictors are
capable of short rapid contraction and the upper esophageal muscles are capable of slow rhythmic movement
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KEYWORD
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