Foramen cecum (frontal bone)
Encyclopedia
The frontal crest
of the frontal bone
ends below in a small notch which is converted into a foramen, the foramen cecum (or foramen caecum), by articulation with the ethmoid.
This foramen varies in size in different subjects, and is frequently impervious; when open, it transmits the emissary vein from the nose
to the superior sagittal sinus
. This has clinical importance in that infections of the nose and nearby areas can be transmitted to the meninges
and brain
from what is known as the danger triangle of the face
.
Frontal crest
The internal surface of the squama frontalis of the frontal bone 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...
of the frontal bone
Frontal bone
The frontal bone is a bone in the human skull that resembles a cockleshell in form, and consists of two portions:* a vertical portion, the squama frontalis, corresponding with the region of the forehead....
ends below in a small notch which is converted into a foramen, the foramen cecum (or foramen caecum), by articulation with the ethmoid.
This foramen varies in size in different subjects, and is frequently impervious; when open, it transmits the emissary vein from the nose
Human nose
The visible part of the human nose is the protruding part of the face that bears the nostrils. The shape of the nose is determined by the ethmoid bone and the nasal septum, which consists mostly of cartilage and which separates the nostrils...
to the superior sagittal sinus
Superior sagittal sinus
The superior sagittal sinus , within the human head, is an unpaired area along the attached margin of falx cerebri. It allows blood to drain from the lateral aspects of anterior cerebral hemispheres to the confluence of sinuses...
. This has clinical importance in that infections of the nose and nearby areas can be transmitted to the meninges
Meninges
The meninges is the system of membranes which envelopes the central nervous system. The meninges consist of three layers: the dura mater, the arachnoid mater, and the pia mater. The primary function of the meninges and of the cerebrospinal fluid is to protect the central nervous system.-Dura...
and brain
Brain
The brain is the center of the nervous system in all vertebrate and most invertebrate animals—only a few primitive invertebrates such as sponges, jellyfish, sea squirts and starfishes do not have one. It is located in the head, usually close to primary sensory apparatus such as vision, hearing,...
from what is known as the danger triangle of the face
Danger triangle of the face
The dangerous triangle of the face or maxillofacial death pyramid consists of the area from the corners of the mouth to the bridge of the nose, including the nose and maxilla...
.