What term describes an immovable joint?

The term that describes an immovable joint is synarthrosis. Synarthroses are characterized by joints that allow little to no movement, making them structurally stable and strong. This type of joint is typically found in areas where stability is more crucial than mobility, such as in the sutures of the skull, where the bones are tightly interlocked.

The other terms refer to different types of joints. Amphiarthrosis describes joints that allow for a slight degree of movement, such as the joints between the vertebrae. Diarthrosis refers to freely movable joints, like the knee or elbow, which provide a wide range of motion. Metaphysis is not a joint classification but rather an area found in long bones where the diaphysis (shaft) meets the epiphysis (end of the bone) during growth. Understanding these distinctions helps clarify the specific characteristics associated with each type of joint.