Final answer:
The incorrect statement about the human pharynx is that it is continuous with the trachea inferiorly. The pharynx is actually continuous with the esophagus inferiorly, while the trachea is part of the respiratory system.
Step-by-step explanation:
The statement concerning the human pharynx that is not correct is "b. The pharynx is continuous with the trachea inferiorly." The pharynx is actually continuous with the esophagus inferiorly, not the trachea. The trachea branches off anteriorly from the laryngopharynx and is part of the respiratory system rather than the digestive system. The other statements are correct: 'a.
During swallowing, pharyngeal muscles constrict' reflects the action of the pharyngeal constrictor muscles; 'c. The pharynx is continuous with the nasal cavity superiorly' represents the nasopharynx's continuity with nasal cavities; and 'd. The muscles of the pharynx are skeletal' indicates the type of muscle that forms the structure of the pharynx.