Summary
Highlights
The video begins by introducing the eight bones of the cranial vault, distinguishing between paired bones (parietals and temporals) and unpaired bones (frontal, sphenoid, occipital, and ethmoid). The parietal bone, which forms the lateral walls of the cranium, is highlighted as the focus of the lesson.
The parietal bone has two main surfaces: an external (exocranial) and an internal (endocranial) face. The external surface features the parietal eminence, the most prominent point, and the superior and inferior temporal lines, where the temporal aponeurosis and temporal muscle insert, respectively. The internal surface shows the parietal fossa, which corresponds to the parietal eminence, and grooves for the middle meningeal vessels. Superiorly, granular foveae are present.
The parietal bone has four borders: a superior border that articulates with the contralateral parietal bone to form the sagittal suture; an inferior border that articulates with the temporal bone, forming the squamosal suture; an anterior border that articulates with the frontal bone, forming the coronal suture; and a posterior border that articulates with the occipital bone, forming the lambdoid suture.
The parietal bone also has four angles. The anterosuperior angle joins the sagittal and coronal sutures at the Bregma. The anteroinferior angle articulates with the sphenoid, frontal, and temporal bones at the Pterion. The posterosuperior angle joins the lambdoid and sagittal sutures at the Lambda. Finally, the posteroinferior angle articulates with the temporal bone near the Asterion.