Inferior Pharyngeal Constrictor - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The inferior pharyngeal constrictor is a muscle of the pharynx. It is described as having two components – the thyropharyngeus and cricopharyngeus. Attachments: Thyropharyngeal fibres originate from the thyroid cartilage Cricopharyngeal fibres originate from the cricoid cartilage All fibres insert posteriorly onto the pharyngeal raphe. Action: Constricts the wall of the pharynx during swallowing to propel the food bolus downwards. Innervation: Vagus nerve (CN X) Blood Supply: Pharyngeal branch of ascending thyroid artery and branches of inferior thyroid artery By TeachMeSeries Ltd (2026) Fig 1Lateral view of the deep structures of the pharynx. Visible are the circular muscles of the pharynx, and the stylopharyngeus. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Frequent questions What is the inferior pharyngeal constrictor? The inferior pharyngeal constrictor is a muscle located in the pharynx, consisting of two parts: the thyropharyngeus and the cricopharyngeus. It plays a crucial role in swallowing by constricting the pharyngeal wall. What are the attachments of the inferior pharyngeal constrictor? The thyropharyngeal part attaches to the thyroid cartilage, while the cricopharyngeal part originates from the cricoid cartilage. Both components insert at the pharyngeal raphe at the back of the pharynx. What is the function of the inferior pharyngeal constrictor? The primary function of the inferior pharyngeal constrictor is to constrict the pharyngeal wall during swallowing, facilitating the downward movement of the food bolus. This action is essential for effective swallowing. Which nerve innervates the inferior pharyngeal constrictor? The inferior pharyngeal constrictor is innervated by the vagus nerve (cranial nerve X). This nerve supplies the muscle, enabling it to perform its swallowing function. What is the blood supply for the inferior pharyngeal constrictor? The blood supply for the inferior pharyngeal constrictor comes from the pharyngeal branch of the ascending thyroid artery and branches of the inferior thyroid artery. This vascular supply is vital for the muscle's health and function. Rate This Article