Lateral mass of atlas
Encyclopedia
The lateral masses are the most bulky and solid parts of the atlas
Atlas (anatomy)
In anatomy, the atlas is the most superior cervical vertebra of the spine.It is named for the Atlas of Greek mythology, because it supports the globe of the head....

, in order to support the weight of the head
Head
In anatomy, the head of an animal is the rostral part that usually comprises the brain, eyes, ears, nose and mouth . Some very simple animals may not have a head, but many bilaterally symmetric forms do....

.

Each carries two articular facets, a superior and an inferior.

It is the origin of the obliquus capitis superior and the insertion of the obliquus capitis inferior.
The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
x
OK