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Frontal Bone

Frontal Bone

Frontal Bone

The frontal (L. frontal = brow) bone lies in the region of the brow. Its shape is similar to a shell.

Interactive Anatomical Interface

Highlight
Frontal
parietal
Temporal
Sphenoid
Zygomatic
maxilla
Nasal
Lateral cartilage
greater alar cartilage
Mandbile
thyrohyoid membrane
thyroid cartilage
cricoid cartilage
cricotracheal ligament
ANterior longitudinal ligament
teeth
cervical vertabrae
first rib
second rib

Highlight
Frontal
parietal
Temporal
Sphenoid
Zygomatic
maxilla
Nasal
Lateral cartilage
greater alar cartilage
Mandbile

Highlight
thyrohyoid membrane
thyroid cartilage
cricoid cartilage
cricotracheal ligament
ANterior longitudinal ligament
teeth
cervical vertabrae
first rib
second rib
Highlight
frontal
Parietal
Sphenoid
temporal
Zygomatic
Maxilla
stylomandibular ligament
Lateral cartilage
posterior atlantoaxial ligament
lateral ligament
greater alar cartilage
teeth
mandible
hyoid
occipital bone
first rib
posterior atlanto-occipital memebrane
thyrohyoid membrane
thyroid cartilage
ricothyroid membrane and ligament
cricoid cartilage
cricotracheal ligament
t1 vertebra
stylohyoid ligament
joint capsule
Anterior longitudinal ligamnent
nuchal ligament
Cervical Vertebra
lacrimal

Highlight
frontal
Parietal
Sphenoid
temporal
Zygomatic
Maxilla
Lateral cartilage
greater alar cartilage
mandible
hyoid
thyrohyoid membrane
thyroid cartilage
ricothyroid membrane and ligament
cricoid cartilage
lateral ligament
cricotracheal ligament

Highlight
stylohyoid ligament
Anterior longitudinal ligamnent
nuchal ligament
Cervical Vertebra
first rib
t1 vertebra
lacrimal
occipital bone
teeth
posterior atlanto-occipital memebrane
posterior atlantoaxial ligament
joint capsule
stylomandibular ligament
-
Highlight
nasal
temporal bone
occipital bone
Internal auditory meatus
Stylomastoid foramen
Temporal
sphenoid
ethmoid
zygomatic bone
zygomatic bone
lacrimal bone
perpendicular plate
lacrimal bone
nasal cartilage
vomer
Nasal concha
Mandible
tectorial membrane of atlanto-axial joint
foramen magnum
tectorial membrane
c1 atlas
crista galli
ethmoidal sinuses
cribriform plate
foramen rotundum
optic foramen
superior orbital fissure
palatine
nuchal ligament
c01 atlas
posterior atlantoaxial ligament
c2 axis
c03 vertebrae
c04 vertebrae
C5 vertebrae

Highlight
nasal
temporal bone
occipital bone
Stylomastoid foramen
Temporal
sphenoid
ethmoid
zygomatic bone
zygomatic bone
lacrimal bone
perpendicular plate
posterior atlantoaxial ligament
nasal cartilage
vomer
Nasal concha
palatine
tectorial membrane of atlanto-axial joint

Highlight
foramen magnum
tectorial membrane
c1 atlas
crista galli
lacrimal bone
Mandible
ethmoidal sinuses
cribriform plate
foramen rotundum
Internal auditory meatus
optic foramen
superior orbital fissure
nuchal ligament
c01 atlas
c2 axis
c03 vertebrae
c04 vertebrae
C5 vertebrae
-
Related:   Adductor Magnus

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Parts

It includes the following 6 parts:

Squamous Part

The orbital plate joins on every side the lower part of the squamous part. The junction of these 2 types is the supraorbital margin. The squamous part presents external and inner surfaces.

The external surface above every supraorbital margin presents a curved elevation named superciliary arch. A rounded bulge between the medial ends of 2 superciliary arches is named glabella. Above the superciliary arch the external surface shows an elevation referred to as frontal tuber or eminence or tuberosity.

The internal surface is deeply concave and presents a median bony ridge termed frontal crest that is continuous above with the sagittal sulcus.

Nasal Part

It’s the portion of bone which projects downwards between the left and right supraorbital margins. It presents a nasal notch, which articulates inferiorly with the 2 nasal bones 1 on every side of median plane and laterally on every side with frontal process of maxilla and the lacrimal bone.

Orbital Plates

Every orbital is a triangular curved plate of bone going horizontally backwards from the supraorbital margin. It creates majority of the roof of the orbit. Both orbital plates are divided from every other by U-shaped ethmoidal notch for adapting cribriform plate of the ethmoid bone.

Zygomatic Processes

One on every side, it goes downwards and laterally from the lateral end of the supraorbital margin. The zygomatic process joins the frontal process of the zygomatic bone. From the posterior margin of every zygomatic process the temporal line arch upwards and backwards and divides into superior and inferior temporal lines.

Related:   Antitragus

Clinical Significance

The frontal bone ossifies in membrane. The primary centers appear 1 for every half of the frontal bone in the region of frontal tuberosity. At birth, frontal bone is created from 2 halves, divided by a median frontal suture. The union between the 2 halves starts at second year and generally finishes by the end of the eighth year. The remains of this suture in the adult in many cases are observed in the region of glabella. It’s referred to as metopic suture.

The fracture of orbital plate of frontal bone results in hemorrhage into the orbit. The hemorrhage assumes a triangular shape underneath the conjunctiva with apex in the direction of the cornea and base in the direction of the orbital margin.

The frontal squama is prone to fracture. In neonates and babies, it’s a depressed fracture (a dimple in the bone), on the other hand in adults it’s a fissured fracture, i.e., the depressed area consistently reveals an unusual line of fracture at its periphery.


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By | 2018-08-08T00:00:00+00:00 August 8th, 2018|Anatomy, Bones and Cartilages, Head and Neck|0 Comments