What Is the Frontal Bone?

The frontalbone is a pair of membranous bones in the upper part of the anterior skull, one of the 29 bones that make up the skull. It is located on the forehead, behind and above the parietal bone, and unites into a single bone on the human head.

The frontalbone is a pair of membranous bones in the upper part of the anterior skull, one of the 29 bones that make up the skull. It is located on the forehead, behind and above the parietal bone, and unites into a single bone on the human head.

Chinese name

Frontal

Foreign name

Frontal bone

Location

Located in the front half of the skull

Make up

Frontal scales, orbital, nose

Frontal bone composition

Divided into three parts: frontal phosphorus, orbital and nasal. It is connected to the ethmoid and nasal bones anteriorly, and to the parietal bone through a coronary suture. Inside and below the frontal bone is a cavity called the frontal sinus.

Frontal scale: it is a scoop-shaped or shell-shaped flat bone that contains a cavity called the frontal sinus;

Orbital part: It is a horizontal thin bone plate extending backwards, forming the upper orbital wall;

Nose: Located between the orbits on both sides, it is horseshoe-shaped, and the notch is a sieve cut.

Frontal observation

1. The u values of the maximum frontal width, the width between crowns, the frontal curvature height, the frontal curvature angle, and the frontal inclination angle were all less than 1.96, and there was no significant gender difference. The minimum frontal width, the frontal sagittal chord, the frontal sagittal arc, the frontal angle, the frontal scale inclination, and the lower frontal inclination u values were all greater than 1.96, with significant gender differences.

2. Males have thicker brow arches than females, and their frontal bones are tilted backwards. The frontal convexity is more uniform. Therefore, the forehead angle, frontal scale angle, and lower frontal angle of males are larger than those of females, and the sex difference is significant. The results are basically consistent with Hao Rukang and Jia Lanpo's exposition on the gender difference of frontal bone.

3. The average forehead width index is 66.34 for males and 60.20 for females, indicating that male forehead is wider than females.

4. The mean value of the frontal curvature index is 88.13 for men and 87.56 for women. The smaller the index, the greater the frontal curvature. It can be seen that the frontal curvature of men is smaller than that of women, which is basically consistent with the morphological observation of the frontal bone. .

5. The frontal angle, frontal inclination, and frontal scale inclination measured in this paper are compared with those in Qingdao. The frontal width index, frontal transverse index, and frontal curvature index measured in this article are not significantly different from those of the modern Xi'an skull index.