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The internal surface of the squamous part is concave and presents in the upper part of the middle line a vertical groove, the sagittal sulcus, the edges of which unite below to form a ridge, the frontal crest; the sulcus lodges the superior sagittal sinus, while its margins and the crest afford attachment to the falx cerebri.
In the human skull, the frontal bone or sincipital bone is a unpaired bone which consists of two portions. [1] These are the vertically oriented squamous part, and the horizontally oriented orbital part, making up the bony part of the forehead, part of the bony orbital cavity holding the eye, and part of the bony part of the nose respectively.
Each frontal sinus extends into the squamous part of the frontal bone superiorly, and into the orbital part of frontal bone posteriorly to come to occupy the medial part of the roof of the orbit. [2] Each sinus drains through an opening in its inferomedial part into the frontonasal duct. [2]
At birth, the human skull is made up of 44 separate bony elements. During development, many of these bony elements gradually fuse together into solid bone (for example, the frontal bone). The bones of the roof of the skull are initially separated by regions of dense connective tissue called fontanelles. There are six fontanelles: one anterior ...
The bone of the forehead is the squamous part of the frontal bone. [4] [5] The overlying muscles are the occipitofrontalis, procerus, and corrugator supercilii muscles, all of which are controlled by the temporal branch of the facial nerve. [2]
The frontal crest is a ridge on the internal surface of the squamous part of the frontal bone formed by the inferior convergence of the two edges of the sagittal sulcus. The frontal crest gives attachment to the falx cerebri .
The pterion is the region where the frontal, parietal, temporal, and sphenoid bones join. [1] It is located on the side of the skull, just behind the temple.It is also considered to be the weakest part of the skull, which makes it clinically significant, as if there is a fracture around the pterion it could be accompanied by an epidural hematoma.
the membranous part, consisting of flat bones, which surround the brain; and; the cartilaginous part, or chondrocranium, which forms bones of the base of the skull. [3] In humans, the neurocranium is usually considered to include the following eight bones: 1 ethmoid bone; 1 frontal bone [5] 1 occipital bone; 2 parietal bones; 1 sphenoid bone; 2 ...