What type of bones occur between the joints of cranial bones?

Sutural bones, also known as Wormian bones, are small, irregularly shaped bones that can be found between the joints of cranial bones, specifically within the sutures of the skull. These bones vary in size and number from person to person, and they often develop as a result of ossification that occurs along the sutures where cranial bones meet. The presence of sutural bones is generally a normal anatomical variation and contributes to the overall structure and stability of the skull.

In contrast, irregular bones are characterized by their complex shapes, which do not fit into standard categories like long, short, or flat bones. While they include vertebrae and certain other bones, they do not specifically appear in the sutures of the skull.

Sesamoid bones are typically small bones that form within tendons where there is considerable friction, tension, or stress, such as the patella. These bones serve to protect tendons and improve their mechanical function, but they do not play a role in the structure between cranial bones.

Flat bones, on the other hand, are generally thin and flat, providing protection to underlying structures and broad surfaces for muscle attachment. They include bones like the ribs, sternum, and specific cranial bones such