College of Massage Therapists of British Columbia (CMTBC) Practice Exam

An infant has premature closure of the suture between the frontal and parietal bones. What is this suture called?

1. Coronal suture

2. Frontonasal suture

3. Lambdoid suture

4. Sagittal suture

The correct answer is: Coronal suture

The correct answer is that the suture between the frontal and parietal bones is known as the coronal suture. This fibrous joint runs across the skull, connecting the frontal bone at the forehead to the parietal bones on the sides and top of the head. In the case of premature closure of the coronal suture, a condition known as craniosynostosis may occur, where the skull cannot grow normally and can lead to a head shape that is more flattened or distorted due to the restriction of growth in certain areas of the skull. Recognizing the significance of the coronal suture in head shape and development is crucial for understanding potential complications arising from its premature closure. The other types of sutures mentioned have different anatomical relations. The frontonasal suture is located between the frontal and nasal bones, and does not involve the parietal bones. The lambdoid suture is found at the back of the skull, connecting the parietal bones with the occipital bone, while the sagittal suture runs between the two parietal bones along the top of the skull. Each of these sutures has specific functions and locations, illustrating the importance of recognizing the coronal suture in this