These 4 muscles are localized on the back of the neck between occipital bone, atlas and axis (the 2 upper cervical vertebrae). In the frontal part of the upper cervical tract you can find the Rectus Capitis Anterior and the Rectus Capitis Lateralis.
Group action: bilateral action extends the head; acting on one side they bend the head on the same side. The obliquus inferior helps in head rotation, too.
The “general” description of “Neck Extensors” is in this group only for practical reasons: it is easy to find here. This is more a “functional”-practical muscle than an anatomic structure.
