Borders
The superior border of the mastoid portion is broad and serrated, for articulation with the mastoid angle of the parietal.
The posterior border, also serrated, articulates with the inferior border of the occipital between the lateral angle and jugular process.
Anteriorly the mastoid portion is fused with the descending process of the squama above; below it enters into the formation of the external acoustic meatus and the tympanic cavity.
Read more about this topic: Mastoid Part Of The Temporal Bone
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