Frontal Bone

Flashcards by mstyyouth, updated more than 1 year ago
Created by mstyyouth about 7 years ago


Features of the Frontal Bone

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Frontal Squama forms the forehead
Frontal Eminences (Frontal Tubers, or Bosses) These paired structures dominate the ectocranial surface marking the location of the original centers of ossification of this bone.
Temporal lines On the lateral ectocranial surface marking the attachment of the temporalis muscle, a major elevator of the mandible, and its covering, the temporal fascia, a fascial sheet that covers the temporalis. Defines the superior edge of the temporal surface (and fossa). Becomes a crest in its anterior, lateral extent (on the zygomatic process of the frontal.
Zygomatic processes form the most lateral and anterior corners of the frontal bone
Superciliary arches (brow ridges) the boney tori over the orbits. They are most prominent in males and are sometimes joined by a prominent glabellar region.
Supraorbital Margins the upper orbital edges, these are notched or pierced by the supraorbital notch or foramen.
metopic suture (frontal suture) is a vertical suture between right and left frontal halves. Its persistence is variable, but only occasionally does it last into adulthood. Traces of it are observed most often in the glabellar region in adults.
Meningeal grooves formed by the long presence of the middle meningeal arteries; present on both sides of the concave endocranial surface of the frontal squama.
Sagittal Sulcus a vertical groove that runs down the midline of the endocranial surface. It lodges the superior sagittal sinus, a large vessel that drains blood from the brain.
Frontal Crest a midline crest confluent with the anterior end of the sagittal sulcus. This crest gives attachment to the falx cerebri, a strong membrane between the two cerebral hemispheres of the brain.
foramen cecum a foramen of varying size, is found at the root or base, of the frontal crest and transmits a small vein from the frontal sinus to the superior sagittal sinus.
Arachnoid foveae (granular foveae) small pits that are especially apparent near the coronal suture along the endocranial midline. They are features associated with another covering layer of the brain, the arachnoid, which is a delicate, avascular membrane lying beneath the dura mater. Tufts of arachnoid, the arachnoid granulations, push outward against the dura, causing resorption of the bone and the formation of this structure on the endocranial surface. on both sides of the midline the endocranial surface of the frontal bears depressions for convolutions of the frontal loves of the brain.
Pars orbitalis (orbital plate) the horizontal portions of the frontal bone. Its endocranial surfaces is undulating (bumpy), conforming to the inferior surface of the frontal lobe. Its inferior surface (orbital surface) is smoother and concave.
Lacrimal fossae for the lacrimal glands, are found at the lateral, inferior parts of the orbital (inferior) surfaces of the frontal bone.
Ethmoidal notch the gap separating the two orbital plates of the frontal. The ethmoid bone fills this notch in the articulated cranium.
Frontal sinuses caverns generally anterior to the ethmoid notch, extending for variable distances between outer and inner bone tables of the frontal and sometimes penetrate the orbital plates. Personal identification in forensic cases has been accomplished by employing radiographs of this region. Distinctive patterns of frontal sinuses can then be used for individuation.
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