Final answer:
The two bones of the maxilla are united by the intermaxillary suture, not to be confused with the coronal or lambdoid sutures, which join different parts of the skull.
Step-by-step explanation:
The maxilla's 2 bones are united by the intermaxillary suture. The coronal suture is another significant joint in the skull that unites the frontal bone to the right and left parietal bones across the top of the skull. All the bones of the skull, except for the mandible, are joined to each other by these fibrous joints. Particularly, the lambdoid suture is an inverted V-shaped joint that unites the occipital bone to the right and left parietal bones on the posterior skull, but it is not involved in the union of the maxillary bones.