from The Century Dictionary and Cyclopedia
- Relating to the forehead and to the zygomatic arches.
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The line of the anterior division of the middle meningeal artery is equidistant from the frontozygomatic suture and the zygomatic arch; it is obtained by joining up the following points: (1) 2.5 cm., (2) 4 cm., and (3) 5 cm. from these two landmarks.
Another method of defining the Sylvian point is to divide the distance between the nasion and inion into four equal parts; from the junction of the third and fourth parts (reckoning from the front) draw a line to the frontozygomatic suture; from the junction of the first and second parts a line to the auricular point.
The point where the great wing of the sphenoid joins the sphenoidal angle of the parietal; it is situated 35 mm. behind, and 12 mm. above, the level of the frontozygomatic suture.
In order to mark out the lateral cerebral (Sylvian) fissure a point, termed the Sylvian point, which practically corresponds to the pterion, is defined 35 mm. behind and 12 mm. above the level of the frontozygomatic suture; this point marks the spot where the lateral fissure divides.
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