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For instance, the alligator diaphragmaticus muscle does not insert on the esophagus and does not affect pressure of the lower esophageal sphincter. [26] The lungs are located in the abdominal compartment of amphibians and reptiles, so that contraction of the diaphragm expels air from the lungs rather than drawing it into them.
Perhaps the most preventable cause of damage to these reflexes originates from smoking. One study has shown that, when compared to non-smokers, the threshold volumes (the lowest volume at which one of these reflexes is triggered) for both the pharyngo-upper esophageal sphincter contractile reflex and reflexive pharyngeal swallowing is increased ...
The pharyngeal muscles (involuntary skeletal) push food into the esophagus. There are two muscular layers of the pharynx: the outer circular layer and the inner longitudinal layer. The outer circular layer includes: Superior constrictor muscle; Middle constrictor muscle; Inferior constrictor muscle
EndoStim therapy directly targets the weak lower esophageal sphincter (LES) muscle, without altering anatomy or using mechanical constraints. EndoStim's proprietary technology uses functional electrical stimulation (a type of neuromodulation) to restore esophageal function, thereby reducing GERD symptoms. Tiny pulses of electric current are ...
The upper esophageal sphincter surrounds the upper part of the esophagus. It consists of skeletal muscle but is not under voluntary control. Opening of the upper esophageal sphincter is triggered by the swallowing reflex. The primary muscle of the upper esophageal sphincter is the cricopharyngeal part of the inferior pharyngeal constrictor. [9]
The esophageal manometry cannot detect any abnormal wave. The cricopharyngeal spasms ("feeling that something is stuck") occur in the cricopharyngeal part of the inferior pharyngeal constrictor muscle, at the bottom of the throat. They cause muscle tension on the cricoid cartilage, leading to a globus feeling.
The inferior fibers are horizontal and continuous with the circular fibers of the esophagus; the rest ascend, increasing in obliquity, and overlap the middle pharyngeal constrictor muscle. The cricopharyngeal part is synonymous with the upper esophageal sphincter (UES), which controls the opening of the cervical esophagus. [4]
The muscles of respiration are the muscles that contribute to inhalation and exhalation, by aiding in the expansion and contraction of the thoracic cavity. The diaphragm and, to a lesser extent, the intercostal muscles drive respiration during quiet breathing. The elasticity of these muscles is crucial to the health of the respiratory system ...
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