Final answer:
The hypophyseal is not a region of the temporal bone; this term refers to the pituitary gland, not a part of the bone itself.
Step-by-step explanation:
The question is asking which of the following options is not a region of the temporal bone. The temporal bone has several subdivisions, including the squamous, mastoid, and petrous portions, as well as the tympanic part, which is not mentioned in the reference but is another well-known region associated with the ear.
Therefore, the correct answer is option A) hypophyseal, as this is not a region of the temporal bone. The term hypophyseal typically refers to the pituitary gland (also known as the hypophysis) and does not denote a region of the temporal bone.