In the context of the human skull, sutures refer to the immovable joints that connect the different bones of the cranium. Specifically, the term "suture" is used to describe the fibrous connective tissue that lies between the edges of the skull bones.

Sutures play several important roles in the structure and function of the cranium:

1. They hold the skull bones together firmly, providing structural support and rigidity to the skull.

2. Sutures allow for some degree of movement, which is especially important during birth when the baby's head needs to pass through the birth canal.

3. The interlocking patterns of the sutures also provide protection for the delicate brain tissue underneath.

Some prominent sutures of the human skull include:

* Coronal suture: It is located at the top of the skull and connects the two parietal bones to the frontal bone.

* Sagittal suture: This suture runs along the midline of the skull and separates the two parietal bones.

* Lambdoid suture: It is located at the back of the skull and connects the parietal bones to the occipital bone.

The study of sutures, known as sutural anthropology, can provide valuable insights into evolutionary biology, developmental biology, and forensic anthropology, assisting researchers in understanding human evolution, identifying individuals, and determining factors affecting skull shape.