Final answer:
Among the options provided, 'antrum' is not a separate section of the stomach, but rather part of the pylorus known as the pyloric antrum.
Step-by-step explanation:
The anatomy of the stomach is indeed characterized by four major regions: the cardia, fundus, body, and pylorus. The pylorus further comprises two parts, namely the pyloric antrum and the pyloric canal. Importantly, the pyloric sphincter, positioned at the exit of the pylorus connecting to the duodenum, regulates the passage of partially digested food into the small intestine.
In the context of the information provided, the correct interpretation is that the antrum, when listed separately, is not considered a distinct section of the stomach. Instead, it is part of the pylorus, specifically referred to as the pyloric antrum. Recognizing the precise anatomy and terminology associated with the stomach's regions and subregions is essential for accurate understanding and communication in the field of anatomy and gastroenterology.