Every time your child's ill and you keep them home from school, it doesn't necessarily mean that you have to see the doctor, said Altmann. Parents should be concerned if their child has a fever lasting several days or is very ill and complaining of pain.
It is named for the Atlas of Greek mythology, because it supports the globe of the head. The atlas is the topmost vertebra and with the axis forms the joint connecting the skull and spine. The atlas and axis are specialized to allow a greater range of motion than normal vertebrae. They are responsible for the nodding and rotation movements of the head. The atlanto-occipital joint allows the head to nod up and down on the vertebral column. The dens acts as a pivot that allows the atlas and attached head to rotate on the axis, side to side. The atlas's chief peculiarity is that it has no body.
The geometry of joints refers to the orientation of joints as either plotted on stereonets and rose-diagrams or observed in rock exposures. In terms of geometry, three major types of joints, nonsystematic joints, systematic joints, and columnar jointing are recognized.Nonsystematic joints are joints that are so irregular in form, spacing, and orientation that they cannot be readily grouped into distinctive, through-going joint sets. Diagonal joints â Joints which typically occur as conjugate joint sets that trend oblique to the fold axes. 2  Strike joints â Joints which trend parallel to the strike of the axial plane of a fold. 3  Cross-strike joints â Joints which cut across the axial plane of a fold.