![]() ![]() They are innervated by the pharyngeal branch of the vagus nerve (CN X) with the exception of the stylopharyngeus muscle which is innervated by the glossopharyngeal nerve (CN IX). The constrictor muscles are circular pharyngeal muscles, which. Circular muscle (CM) fibres fiom the proximal esophagus also contribute to the sphincter (Netter 197 1, Asoh and Goyal 1978. ![]() There are two muscular layers of the pharynx: the outer circular layer and the inner longitudinal layer.ĭuring swallowing, these muscles constrict to propel a bolus downwards (an involuntary process).ĭuring swallowing, these muscles act to shorten and widen the pharynx. muscles of the pharynx are involved in digestion and provide swallowing. The pharyngeal constrictor muscles form a funnel, and the mouth of the esophagus is like a transverse slit at the bottom of this funnel. The pharyngeal muscles (involuntary skeletal) push food into the esophagus. This group of muscles constrict the midpharyngeal cavity during retrusive movement of the tongue. These results provide information that will help a comprehensive understanding of the effects of pharyngeal muscles on movement.The pharyngeal muscles are a group of muscles that form the pharynx, which is posterior to the oral cavity, determining the shape of its lumen, and affecting its sound properties as the primary resonating cavity. Purpose Fibers of the glossopharyngeal part of the superior constrictor muscle are connected with fibers of the transverse lingual muscle, forming a ring of muscle at the base of the tongue. A group of muscles called the pharyngeal muscles, which consist of the outer circular layer and the inner longitudinal layer, forms the lumen of the pharynx. The pharyngeal constrictor muscles that form the. Introduction The pharynx is the digestive system posterior to the nasal cavity, oral cavity, and larynx and divides into the oropharynx, nasopharynx, and laryngopharynx. 54 To add additional confusion, the IPC forms a functional structure. 34, 53 It contains multiple parts, with resultant confusion regarding the proper nomenclature of these different components. The variant muscle bundles play their own role in pharyngeal movement according to their morphology. Having entered through the mouth, food passes back to the pharynx, via a route also taken by liquids and air. The inferior pharyngeal constrictor is the inferior-most muscle of the pharynx, and is the thickest of the three circular pharyngeal constrictors. Circular muscles: Superior, middle and inferior constrictors. Axial T1-weighted images from inferior to superior: (A) middle constrictor (yellow), stylopharyngeus (green). 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). Muscles of pharynx: Pharynx has 3 circular and 3 longitudinal muscles. 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. ![]()
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