An irregular bone is one of the types of bones classified by shape.
Irregular bones have complicated shapes that cannot be classified as "long", "short" or "flat". Their shapes are due to the functions they fulfill within the body e.g. providing major mechanical support for the body yet also protecting the spinal cord (in the case of the vertebrae).
- Atlas bone
- Axis bone and other vertebrae
- Hyoid bone
- Sphenoid bone
- Zygomatic bones and other facial bones.
See also books about orthopaedics.