Abstract
Pterion is an important bony landmark of skull present on norma larteralis. Variations of bony pattern at pterion are common and are of clinical importance. Present study was carried out in Department of Anatomy IIMS and R to find out variations at pterion in dry human skull of north Indian origin. We utilized 60 dry human skulls for the study. The pattern of pterion and presence of sutural was observed. Spheno parietal was the commonest type of pterion in both left (86.7%) and right (91.7%) side of skull, stellate type was found in (5%) of skulls and frontotemporal was found in 3.3% of left and right each. Sutural bone was present in 5% skulls on the left side. Variation in pattern of pterion and presence of sutural bones are important from surgical and radiological point of view.
Highlights
Pterion is defined as an H-shaped sutural junction formed by the meeting of four bones: frontal, parietal, temporal and sphenoid on norma lateralis of the skull[1]
1) Spheno-parietal type: Greater wing of sphenoid articulates with the parietal bone to form the letter ‘H. 2) Frontotemporal type: Squamous part of the temporal bone articulates with the frontal bone. 3) Stellate type: Here all bones articulate at a point in the form of letter ‘K’. 4) Epipteric type: A sutural bone is lodged between the 4 bones forming the pterion
On observing the sutural pattern and the bones articulating to form the pterion we found that Sphenoparietal type of pattern was most common both the sides
Summary
Pterion is defined as an H-shaped sutural junction formed by the meeting of four bones: frontal, parietal, temporal and sphenoid on norma lateralis of the skull[1]. Pterion is the weakest part of the skull and the most interesting bone meeting points in craniofacial osteology. Pterional fractures may tear the frontal branch of middle meningeal artery leading to extra dural haematoma[2]. It is a primary site during surgery to gain access to the sphenoid ridge and optic canal[3]. According to the bony pattern of pterion it was classified by different authors e.g. classified into four types (sphenoparietal, frontotemporal, stellate, and epipteric) by Murphy in 1956, six types by Wang et al 2006 (sphenoparietal, frontotemporal, stellate, epipteric zygomatico-parietal and zygomatico-temporal)[4,5]
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