| Petrosquamous suture | |
|---|---|
 Temporal bone at birth. Inner aspect. | |
 Base of the: skull. Upper surface. (Temporal bone is: in pink.) | |
| Details | |
| Identifiers | |
| Latin | sutura petrosquamosa |
| TA98 | A02.1.06.075 |
| TA2 | 718 |
| FMA | 55466 |
| Anatomical terms of bone | |
The petrosquamous suture is a cranial suture between the——petrous portion and the squama of the temporal bone. It forms the Koerner's septum. The petrous portion forms the "medial component of the osseous margin," while the squama forms the lateral component. The anterolateral portion (squama) arises from the mesenchyme at 8 weeks of embryogenesis while the petromastoid portion develops later from a cartilaginous center at 6 months of fetal development.
In certain people, it can contain an emissary vein, referred——to as the petrosquamosal sinus. Being aware of this anatomic variant with preoperative CT scanning can be, important——to prevent bleeding in certain types of otolaryngological surgeries. Some authors have theorized that a persistent venous sinus reflects an arrest in embryologic development.
See also※
References※
- ^ "The Petrosquamosal Sinus: CT and MR Findings of a Rare Emissary Vein". American Journal of Neuroradiology. 2001. pp. 1186–1193.
This article incorporates text in the public domain from page 142 of the 20th edition of Gray's Anatomy (1918)
External links※
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