Irregular Bones

What are Irregular Bones

As the name suggests, irregular bones have unique shapes that cannot be classified as long, short, or flat bones.

Like short bones, irregular bones also primarily comprise spongy bone, with a layer of compact bone forming the outer surface.

List of Irregular Bones in the Body

Irregular Bones

In the vertebral column

  • All the vertebrae (cervical, thoracic, lumbar)
  • Sacram
  • Coccyx

In the skull


  • These bones provide stability and shape the spinal column and parts of the head and face.
  • The bones in the vertebral column, especially the sacrum, provide multiple attachment points for the skeletal muscles and tendons. This keeps the back and pelvic region flexible, allowing movement.


  1. Irregular Bones –
  2. Irregular bones –
  3. Types of Bone –