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Topic

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Nasal part of frontal bone

The nasal part of the frontal bone is the inferior midline portion of the frontal bone that contributes to the root of the nose and the roof of the nasal cavity. It forms an important junction between the frontal bone, nasal bones, and maxilla and plays a key role in the architecture of the anterior skull base and upper facial skeleton.

This region is an important anatomical and radiologic landmark, especially in facial trauma assessment, sinus evaluation, and skull base imaging.

Synonyms

  • Nasal portion of frontal bone

  • Nasal process of the frontal bone (commonly used descriptively)

Location

  • Located in the inferior midline aspect of the frontal bone

  • Forms the superior boundary of the nasal bones

  • Situated anterior to the anterior cranial fossa

  • Superior to the nasal cavity

  • Inferior to the frontal squama

  • Centered around the nasion

Anatomical components

  • Nasal part of the frontal bone:

    • Forms the root of the nose

  • Frontal crest (internal surface):

    • Attachment for falx cerebri

  • Foramen cecum (variable):

    • Located posterior to the nasal part

  • Articulations:

    • Nasal bones

    • Maxilla (frontal process)

    • Ethmoid bone

Relations

Anteriorly:

  • Skin and soft tissues of the nasal root

Posteriorly:

  • Anterior cranial fossa

  • Frontal lobes (via dura mater)

Inferiorly:

  • Nasal bones

  • Nasal cavity

Superiorly:

  • Frontal squama

Laterally:

  • Frontal processes of the maxilla

  • Orbital plates of the frontal bone

Associated landmarks

  • Nasion: Junction of frontal bone and nasal bones

  • Glabella: Smooth prominence superior to the nasal part

  • Foramen cecum: Midline opening posterior to nasal part (may transmit emissary vein)

X-ray appearance

Skull and facial bone radiographs:

  • Nasal part of frontal bone: Dense cortical bone at the nasal root

  • Nasion: Identifiable junction point of frontal and nasal bones

  • Margins: Smooth, continuous cortical outline

  • Projection dependence: Best appreciated on lateral skull and Waters views

CT appearance

Non-contrast CT:

  • Bone cortex: Hyperdense compact bone at the nasal root

  • Articulations: Clear visualization of frontal–nasal and frontal–maxillary junctions

  • Adjacent air spaces: Nasal cavity and frontal sinus margins well defined

Post-contrast CT:

  • Bone: No enhancement

  • Adjacent soft tissues: Expected enhancement of mucosa and vessels

3D CT VRT appearance

Volume-rendered technique (VRT):

  • Nasal root contour: Smooth transition between frontal bone and nasal bones

  • Midline symmetry: Clearly appreciated

  • Articulation lines: Visible frontal–nasal junctions

  • Clinical utility: Useful for evaluating facial bone alignment and contour

MRI appearance

T1-weighted images:

  • Cortical bone: Low signal intensity

  • Diploic marrow: Intermediate to high signal

  • Adjacent soft tissues: Normal signal characteristics

T2-weighted images:

  • Bone cortex: Low signal

  • Nasal cavity air: Signal void

  • Adjacent mucosa: Intermediate to high signal

CT image

Nasal part of frontal bone ct sag

X-Ray image

Nasal part of frontal bone

CT VRT 3D image

Nasal part of the frontal bone