#anatomy 

1. The lambdoid suture lies between the occipital bone and the two parietal bones. Sutural bones are common along this suture.
2. The occipitomastoid suture lies between the occipital bone and the mastoid part of the temporal bone.
3. The parietomastoid suture lies between the parietal bone and the mastoid part of the temporal bone.
4. The posterior part of the sagittal suture is also seen.
Lambda, parietal foramina and obelion have been examined in the norma verticalis.
2. The external occipital protuberance is a median prominence in the lower part of this norma. It marks the
junction of the head and the neck. The most prominent point on this protuberance is called the inion.
3. The superior nuchal lines are curved bony ridges passing laterally from the protuberance. These also mark
the junction of the head and the neck. The area below the superior nuchal lines will be studied with the
norma basalis.
4. The highest nuchal lines are not always present. They are curved bony ridges situated about 1 cm above the superior nuchal lines. They begin from the upper part of the external occipital protuberance and are more arched than the superior nuchal lines.
5. The occipital point is a median point a little above the inion. It is the point farthest from the glabella.