The ______ ______ (two words), a syndesmosis, which provides a pivot point where two parallel-aligned bones, like the tibia and fibula, can move against each other.
The two words that describe the syndesmosis providing a pivot point for bones like the tibia and fibula are "syndesmotic joint".
The answer to the blank is "syndesmosis joint."
To find this answer, one can start by understanding the given clues. The question mentions two parallel-aligned bones, specifically the tibia and fibula. These bones are located in the lower leg. The question also mentions that this joint provides a pivot point where these bones can move against each other.
With this information, we can infer that the joint being referred to is a syndesmosis joint. Syndesmosis joints are a type of joint that connects bones with fibrous connective tissue, allowing limited movement. In the case of the tibia and fibula, they are connected by a syndesmosis joint known as the distal tibiofibular joint, which allows for a small amount of movement between the two bones.
Therefore, the answer to the missing words in the question is "syndesmosis joint."