What distinguishes cartilaginous joints from fibrous joints?

Cartilaginous joints are distinctly characterized by their use of cartilage to connect the articulating bones. This type of joint allows for a certain degree of movement, which can be either limited or slightly flexible depending on the specific type of cartilaginous joint. There are two main types: synchondroses (which are immobile) and symphyses (which allow for some movement).

In contrast, fibrous joints are connected by dense connective tissue, providing little to no movement, and do not incorporate cartilage in their structure. The statement about cartilaginous joints utilizing cartilage is fundamental to understanding the differentiating features of these joints.

Other options do not accurately represent the primary distinction; while it's true that cartilaginous joints may allow for greater movement compared to fibrous joints, this is not the defining characteristic. Moreover, cartilaginous joints are not restricted to locations like the skull, which is where many fibrous joints are found, and they do involve ligaments in various capacities that contribute to structural stability. Thus, the primary distinguishing feature is indeed the use of cartilage for connection.