Which of the following is NOT a suture of the fetal skull?

The frontal suture is not considered a suture of the fetal skull like the others listed. The frontal suture specifically refers to the area where the two frontal bones of an infant's skull meet. During fetal development, the infant's skull is made up of several bones, which are interconnected by sutures. The sagittal, lambdoidal, and coronal sutures are critical in defining the shape and structure of the fetal skull.

The sagittal suture runs from the front to the back of the skull, separating the left and right parietal bones. The lambdoidal suture is located at the back of the skull and separates the parietal bones from the occipital bone. The coronal suture runs across the skull, separating the frontal bone from the two parietal bones. These sutures are important for the growth and flexibility of the skull as the fetus develops and when it passes through the birth canal.

In contrast, the frontal representation refers to bone structure rather than a functional suture joining multiple bones. Thus, it does not fit in the category of sutures like the other three recognized in fetal skull anatomy. Understanding the distinction between bone connections and functional sutures is crucial in obstetric education and fetal