Petrosquamosal Suture and Lamina

Abstract

The junction of the petrosal and squamosal portions of the temporal lobe has important relationships that are of interest to the otologist. The resultant suture extends from the glaserian fissure across the top of the middle ear cleft and into the mastoid portion of the temporal bone. It may permit quick passage of infection from the middle ear to the middle cranial fossa. The petrosa may override the squama, forcing it down into the tympanum, where it could cause malleus fixation and a conductive type hearing loss. In the mastoid the suture is identifiable on the surface, but in the interior it is represented by the petrosquamosal lamina. The deeper portion in the petrosal portion of the mastoid may be easily overlooked in surgery of the mastoid and may lead to facial nerve injury.

Transmastoid extradural–intracranial approach for repair of transtemporal meningoencephalocele: A review of 31 consecutive cases

“…Congenital encephaloceles are rare developmental anomalies that may present in childhood or during adulthood 3, 6. A delay or failure of fusion of the petrosquamous suture line results in a tegmental defect that serves as a route for transmission of a TL encephalocele 5, 16. Such delay or absence of fusion can be caused by growth abnormalities, cytotoxic medications such as chemotherapeutic agents, and radiotherapy given at an earlier age.…”

“…Spontaneous encephalocele can be congenital or idiopathic. Congenital encephalocele results from disturbance in the normal ossification of the temporal bone, mainly at the junction between the petro‐squamous junction 5, 6. Fusion of the petrosquamous suture is usually complete by 1 year of age.…”

Association of Benign Intracranial Hypertension and Spontaneous Encephalocele With Cerebrospinal Fluid Leak

“…The only identifiable pathology noted at the time of surgery is bony and dural dehiscence (1). However, there have been several theories as to the cause, including the congenital defect theory (2) and the arachnoid granulation theory (3,4). The incidence of bony tegmen defect, 21% according to some studies, is much higher than that of spontaneous encephalocele and leaves unexplained the cause of SE-CSFO (5).…”

Anatomical variations during mastoidectomy

“…Cerrah antrumu anterio-inferiorda ararken fasiyal sinire de hasar verebilir 1 . Bazı çalışmalarda da Körner septumunun attik blokajına sebep olarak kronik orta kulak iltihaplanmalarına zemin oluşturduğu belirtilmektedir 4 .…”