What anatomical term describes an immovable joint?

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The anatomical term that describes an immovable joint is synarthrosis. Synarthrosis refers to a type of joint where the ends of bones are very tightly bound together, allowing for little to no movement. These joints provide stability and support to the skeletal structure. An example of synarthrosis is the sutures found between the bones of the skull, which are tightly fused to protect the brain.

In contrast, diarthrosis refers to freely movable joints, such as the shoulder or knee, which allow for a range of movements. Amphiarthrosis describes joints that permit a slight degree of movement, such as those found between the vertebrae, offering flexibility while maintaining stability. Synovial is not a term for a type of joint but rather refers to joints characterized by a fluid-filled capsule that allows for movement, further differentiating them from synarthrosis joints.