Answer
Characteristics of superior, middle and inferior pharyngeal constrictors.
Location: these muscles encircle the pharynx on its posterior and lateral sides -- forming a kind of muscular funnel.
Action:
In the process of swallowing, these three muscle contract in descending order-- from superior to middle to inferior-- and force food (bolus) down into the esophagus.
Work Step by Step
Origin: Medial pterygoid plate, mandible, hyoid bone, stylohyoid ligament and cartilage of larynx.
Insertion: Posterior medial seam of pharynx and basilar part of occipital bone
Innervation: Glossopharyngeal (CN iX) and vagal (CN X) nerves
