What is thyropharyngeus muscle?
The thyropharyngeus muscle originates from the thyroid cartilage and inserts into the median pharyngeal raphe. The cricopharyngeus muscle originates from the cricoid cartilage and blends into the esophageal muscle. When the inferior constrictors contract, they constrict the lower portion of the pharynx.
What are the pharyngeal constrictors?
The pharyngeal constrictor muscles form a funnel, and the mouth of the esophagus is like a transverse slit at the bottom of this funnel. At the esophageal inlet, the fibers of the cricopharyngeal muscle run transversely, thus forming the UES.
What is pharyngeal shortening?
Profound pharyngeal shortening during bolus transit through the pharynx eliminated access to the larynx and elevated the upper esophageal sphincter to within 1.5 cm of the retrolingual pharynx.
What is pharyngeal musculature?
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. The pharyngeal muscles (involuntary skeletal) push food into the esophagus.
What nerve Innervates the thyropharyngeus?
Inferior pharyngeal constrictor muscle
| Origins | Thyropharyngeal part: Oblique line of thyroid cartilage Cricopharyngeal part: Cricoid cartilage |
|---|---|
| Innervation | Both parts: Branches of pharyngeal plexus (CN X) Cricopharyngeal part: also receives branches of external and/or recurrent laryngeal branches of vagus nerve (CN X) |
What nerve Innervates pharynx?
the vagus nerve
The pharyngeal branches of the vagus nerve provide motor innervation to all the structures and muscles of the pharynx, except the stylopharyngeus. The latter receives motor innervation from the glossopharyngeal nerve.
What is the function of the pharyngeal constrictors?
Function. The main function of the superior pharyngeal constrictor is the constriction of the upper part of the pharynx. This action facilitates the act of deglutition by pushing the bolus inferiorly, into the esophagus and stomach.
What forms the pharyngeal plexus?
The pharyngeal plexus sends some branches between the middle and inferior constrictors and other branches between the superior and middle constrictors 4,6. It is formed by the pharyngeal branches from the vagus and glossopharyngeal nerves and the cervical sympathetic 3-7.
What is the laryngopharynx?
Laryngopharynx (or hypopharynx): The bottom part of the throat is near the larynx (or voice box). It regulates the passage of air to the lungs and food and fluid to the esophagus.
What is the posterior pharynx?
The posterior aspect of the pharynx is lined by the posterior pharyngeal wall and soft tissue that covers the cervical spine. The tongue is retracted by the mouth gag and is visible in the top of the picture. The base of tongue forms the base of the pharynx. The base of tongue contains the lingual tonsils.