The Cranial Sutures
The cranial sutures are fibrous joints connecting the bones of the skull. To the unknowing individual these shallow grooves may look like fractures. In fact the intricate windy lines of these thin lines mark the adherence between the bones and the growth and closure of the cranial fontanelles. The sutures found in the skull are as follows:
- The frontonasal suture joins the frontal bone and the nasal bones.
- The frontozygomatic suture articulates the frontal bone and the zygomatic bone.
- The zygomaticomaxillary suture links the zygoma and the maxilla.
- The two maxillary bones are anteriorly connected by the intermaxillary joint. The width of this joint is significantly increased during a maxillary expansion treatment.
- The metopic suture is a persistent childhood suture that runs down the midline of the frontal bone.
- The sagittal suture joins the two parietals.
- The lambdoid suture marks the borders between the parietal and occipital bones.
- The sagittal and lambdoid sutures converge into a lambda.
- The coronal suture separates the frontal bone and the parietal bone.
- The coronal and the sagittal sutures converge into the bregma.
- The sagittal and lambdoid sutures are also visible from this angle.
- The squamous suture joins the parietal bone and the temporal bone.
- The sphenofrontal suture links the frontal bone and the sphenoid bone.
- The sphenoparietal suture articulates the sphenoid bone and the parietal bone.
- The occipitomastoid suture is the groove between the occipital bone and the mastoid process of the temporal bone.
- The temporozygomatic suture is the adherence of the temporal bone and the zygomatic bone.
- The coronal, lambdoid and frontozygomatic sutures are also visible from this angle.
- The median palatine suture connects the horizontal plates of the palatines. It is the posterior continuation of the intermaxillary suture.
- The transverse palatine suture adheres the palatine process of the maxillary bone to the palatine bone.
- The petro-occipital suture is the junction between the occipital bone and the petrous part of the temporal bone.
- The spheno-occipital suture articulates the sphenoid bone and the occipital bone.
- The petrosquamous suture is the interosseous border the petrous part and the squamous part of the temporal bone.
- The petrotympanic suture (also known as the squamotympanic suture) is a temporal fissure that runs between the temporomandibular joint (TMJ) and the tympanic cavity.
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