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Laboratory 31. Pharynx
Step 10. The Pharyngeal Constrictor Muscles

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The middle pharyngeal constrictor muscle [cross-section] attaches anteriorly to the hyoid bone and the stylohyoid ligament. Like the other pharyngeal constrictor muscles, it inserts posteriorly into the median pharyngeal raphe. The inferior part of the middle pharyngeal constrictor muscle is overlapped by the superior part of the inferior pharyngeal constrictor muscle.

The inferior pharyngeal constrictor muscle attaches to the thyroid and cricoid cartilages. Fibers of the inferior pharyngeal constrictor muscle course superiorly and posteriorly to insert into the median pharyngeal raphe. The most inferior fibers of the inferior pharyngeal constrictor muscle are termed the cricopharyngeus muscle, which is continuous inferiorly with the muscular wall of the esophagus.
 

Links and References:
Grant's: 8.57
Netter: 61
Rohen/Yokochi: 161