Frontal bone skull9/11/2023 The coronal suture is a syndesmosis that joins both parietal bones and the posterior aspect of the frontal bone. The bregma is the location where the sagittal and the coronal sutures meet. There are two anatomically important landmarks found on the external surface of the skull that the frontal bone contributes to the bregma and the pterion. Sutural connections the frontal bone has to neighboring bones are dense fibrous connective tissue joints termed syndesmosis. As the frontal bone ascends posteriorly and laterally, it will meet the temporal bone, then finally the parietal at the top of the skull. Posteriorly and inferiorly, the frontal bone meets the sphenoidal bone. Within the cranium, the frontal bone connects with the ethmoid bone inferiorly and medially. It also contains a small zygomatic process to connect with the zygomatic bone just lateral to the lateral wall of the socket. The frontal bone alone creates the roof of the orbit. Posterior and lateral to the zygomatic bones, it connects again with the temporal surface of the greater wing of the sphenoid, then finally the parietal bones posteriorly. From medial to lateral, it connects to the lacrimal bone, sphenoid bone, and the zygomatic bone. Laterally from the maxillary bone, it connects to various bones that form the posterior aspect of the orbit. Laterally to this, it joins the superior aspect of the maxillary bone bilaterally. Anterior and medially it joins the nasal bone to create the area called the nasion. The frontal bone borders several bones on its external surface.
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