Final answer:
The division of dense proper connective tissue that is not listed among regular, irregular, or elastic is Fibrous, which is not considered a division of dense proper connective tissue.
Step-by-step explanation:
Dense Proper Connective Tissue
The question relates to the division of dense proper connective tissue. Among the provided options, the one that is not a division of dense proper connective tissue is Fibrous. Dense proper connective tissue is categorized mainly into two types: dense regular and dense irregular connective tissues. Dense regular connective tissue is characterized by collagen fibers that are packed into parallel bundles which enhance tensile strength and are found in structures like tendons and ligaments.
On the other hand, dense irregular connective tissue has collagen fibers that are interwoven into a mesh-like network providing strength in multiple directions, such as in the dermis of the skin. Lastly, elastic dense connective tissue contains elastin fibers and also offers the ability to stretch and return to the original form, being a part of certain ligaments.