Lateral mass of atlas - Massa lateralis atlantis
The lateral masses are the most bulky and solid parts of the atlas, in order to support the weight of the head. Each carries two articular facets, a superior and an inferior.
This definition incorporates text from a public domain edition of Gray's Anatomy (20th U.S. edition of Gray's Anatomy of the Human Body, published in 1918 – from http://www.bartleby.com/107/).
General Anatomy > Bones; Skeletal system > Axial skeleton > Vertebral column > Cervical vertebrae [C I-C VII] > Atlas [C I] > Lateral mass of atlas