![]() This band of striated muscle, innervated by the pharyngeal branch of the vagus nerve, is contracted at rest, creating a high-pressure zone about 12 cm in length. The muscle is described as having two main parts, thyropharyngeus and cricopharyngeus, which originate from the oblique line of the thyroid lamina and lateral aspect of the cricoid cartilage respectively. These results provide information that will help a comprehensive understanding of the effects of pharyngeal muscles on movement. It is created by the convergence of the inferior pharyngeal constrictor muscle and the cricopharyngeus muscle (Fig. The inferior pharyngeal constrictor muscle is one of the pharyngeal constrictor muscles. The variant muscle bundles play their own role in pharyngeal movement according to their morphology. A variation of the STP, in which it ran transversely and merged with the SC muscle, was found in 2.3% (1/44) of cases while a variation of the SC muscle, in which it ran longitudinally and merged with the contralateral constrictors, was found in 11.4% (5/44). The accessory bundle of STP and petropharyngeus was found in 18.2% (8/44) and 25.0% (11/44) of cases, respectively. ![]() Forty-four specimens (22 right and 22 left sides) from embalmed Korean adult cadavers (13 males, 9 females age range, 46–89 years mean age, 69.2 years) were used in this study. The aims of this study were to clarify the topography and variations stylopharyngeus (STP) and superior constrictor (SC) muscles, and to examine what role they play in the pharyngeal movement. The cricopharyngeus muscle from patients and controls differed from inferior constrictor muscle by virtue of type 1 fibre predominance and greater fibre. ![]()
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