**Core Concept**
The frontal bone is a single bone that forms the forehead and upper part of the eye socket. However, it develops from two halves, which eventually fuse together during fetal development. The suture between these two halves is a fibrous joint that remains patent throughout life.

**Why the Correct Answer is Right**
The suture between the two halves of the frontal bone is known as the frontal suture. It is a fibrous joint that is formed by the interdigitation of the inner tables of the two frontal bone halves. The frontal suture is a remnant of the embryological process of cranial development, where the two frontal bone halves are initially separate and eventually fuse together.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the frontal suture is not located between the frontal and parietal bones, but rather between the two halves of the frontal bone itself.
* **Option B:** This option is incorrect because the coronal suture is located between the frontal and parietal bones, not between the two halves of the frontal bone.
* **Option C:** This option is incorrect because the sagittal suture is located between the two parietal bones, not between the two halves of the frontal bone.

**Clinical Pearl / High-Yield Fact**
The frontal suture is an important landmark in neurosurgery, as it can be used as a reference point for surgical procedures involving the frontal lobe. Additionally, the frontal suture can be a site of pathology, such as a frontal suture osteoma, which can cause symptoms such as headaches and seizures.

**Correct Answer:** C. Lambdoid suture