Final answer:
The term pertaining to the upper orifice of the stomach and pylorus relates to the pyloric antrum, pyloric canal, and pyloric sphincter, which are integral parts of the upper GI tract involved in digestion.
Step-by-step explanation:
The word that means "pertaining to the upper orifice of the stomach and pylorus" is related to the anatomy of the upper gastrointestinal (GI) tract, which includes the mouth, pharynx, esophagus, and stomach. The pylorus is the lower part of the stomach that connects to the duodenum, and the term specifically referring to it includes the pyloric antrum, pyloric canal, and the pyloric sphincter.
These parts of the stomach play a critical role in digestion, where the pyloric antrum is the wider, more superior part of the pylorus that connects to the body of the stomach, the pyloric canal is the narrow, more inferior part that connects to the duodenum, and the pyloric sphincter is the sphincter that controls stomach emptying.