The squamous suture is the arched fibrous joint on the side of the skull where the thin squamous part of the temporal bone overlaps the lower border of the parietal bone. Unlike most cranial sutures, its edges are bevelled and overlap like scales rather than interlocking in a zigzag. It runs from near the pterion in front to the region of the parietal notch behind.
| Articulations | |
|---|---|
| Landmarks |
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| Ossification | Forms between the membrane-ossified temporal squama and parietal bone; it is often the last cranial vault suture to fuse and may stay partly unfused throughout life. |
Isolated squamous suture synostosis is very rare and usually causes little deformity, though it may accompany other synostoses. The suture lies over the temporal lobe and near the course of the middle meningeal vessels, so fractures of the thin temporal squama crossing it can be associated with epidural haematoma. It is one of the sutures most likely to remain partly open into old age.
A fracture of the thin bone above the ear, which may cross the squamous suture and tear the middle meningeal artery, producing an epidural haematoma that needs urgent surgery.
A rare premature fusion of the squamous suture, often found together with other synostoses and usually producing only mild skull shape change.
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