Parietal notch
Incisura parietalis
Definition
The parietal notch is the angle formed where the upper edge of the squamous part of the temporal bone (i.e. the squamous suture) meets the parietomastoid suture above the mastoid process. The notch can be seen on the posterior half of the lateral side of the skull, right in front of the asterion point. The posteroinferior corner of the parietal bone fits tightly into this angle. The parietal notch is useful for identifying the front edge of the sigmoid venous sinus in the cranial cavity.
References
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Text written by Muhammad A. Javaid, MD, PhD © 2024 IMAIOS.
Castle MS, Myers OB, Pickett BP. The parietal notch (Brammer's pointer): Accuracy of a surface landmark for temporal bone surgery. Laryngoscope Investig Otolaryngol. 2022 Jul 15;7(4):1136-1142.
