Pharyngeal plexus cricopharyngeus part can also receive innervation from the recurrent laryngeal nerve and/or the external laryngeal nerve.Īs soon as the bolus of food is received in the pharynx, the elevator muscles relax, the pharynx descends, and the constrictors contract upon the bolus and convey it down into the esophagus. The thickest of the three constrictors arises from the sides of the cricoid and thyroid cartilage.Īscending pharyngeal artery, branch of the external carotid artery. Similar to the superior and middle pharyngeal constrictor muscles, This Muscle Nerve supply is the vagus nerve (cranial nerve X), specifically, by branches from the pharyngeal plexus and by neuronal branches from the recurrent laryngeal nerve. Some of its fibers are lost in the constrictor muscles while others, joining the palatopharyngeus muscle, are inserted into the posterior border of the thyroid. The tongue consists of both extrinsic (genioglossus (GG), styloglossus (STY), hyoglossus (HY), palatoglossus (PG)) and intrinsic (vertical (V), transverse (T), superior longitudinal (SL), inferior longitudinal (IL)) musculature. Action: Constricts the wall of the pharynx during swallowing to propel the food bolus downwards. Travers, in The Rat Nervous System (Fourth Edition), 2015 Myotopic Organization. All fibres insert posteriorly onto the pharyngeal raphe. It is described as having two components the thyropharyngeus and cricopharyngeus. The Inferior pharyngeal constrictor, the thickest of all three constrictors, arises from the sides of the cricoid and thyroid cartilage. The inferior pharyngeal constrictor is a muscle of the pharynx.
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