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Zygomatic process of frontal bone

The zygomatic process of the frontal bone is a lateral bony projection of the frontal bone that articulates with the zygomatic bone, forming the frontozygomatic suture. It contributes to the superolateral margin of the orbit and plays an important role in the structural framework of the orbital rim and upper face.

This process is an important anatomical landmark in craniofacial anatomy, trauma assessment, and surgical planning involving the orbit and zygomatic complex.

Synonyms

  • Frontozygomatic process

  • Orbital process of the frontal bone (lateral part)

Location

  • Located at the lateral aspect of the frontal bone

  • Forms the superolateral margin of the orbital rim

  • Articulates inferiorly with the zygomatic bone

  • Situated lateral to the frontal sinus

  • Anterior to the temporal fossa

  • Superior to the zygomatic bone

Anatomical components

  • Bony projection of the frontal bone

  • Frontozygomatic suture:

    • Fibrous joint between frontal and zygomatic bones

  • Orbital surface:

    • Contributes to the roof and lateral wall of the orbit

  • External (facial) surface:

    • Forms part of the forehead contour

Relations

Anteriorly:

  • Forehead soft tissues

  • Frontalis muscle and subcutaneous fat

Posteriorly:

  • Temporal fossa

  • Temporalis muscle

Inferiorly:

  • Zygomatic bone

  • Lateral orbital wall

Superiorly:

  • Frontal bone proper

Medially:

  • Orbital plate of the frontal bone

  • Frontal sinus (variable proximity)

Laterally:

  • Temporal fascia

Developmental anatomy

  • Develops from membranous ossification

  • Frontozygomatic suture remains patent throughout life

  • Growth influenced by orbital and facial development

X-ray appearance

Skull and facial bone radiographs:

  • Zygomatic process: Dense bony projection at the superolateral orbital margin

  • Frontozygomatic suture: Thin radiolucent line separating frontal and zygomatic bones

  • Margins: Well-defined cortical outlines

  • Best visualized on: Oblique and occipitomental (Waters) views

CT appearance

Non-contrast CT:

  • Zygomatic process: Cortical bone with high attenuation

  • Articulation: Clear visualization of the frontozygomatic suture

  • Orbital rim: Continuous bony contour

  • Evaluation strength: Excellent for subtle fractures and alignment

Post-contrast CT:

  • Bone: No enhancement

  • Adjacent soft tissues: Expected enhancement patterns

3D CT VRT appearance

Volume-rendered technique (VRT):

  • Zygomatic process: Prominent superolateral orbital projection

  • Frontozygomatic suture: Visible seam between frontal and zygomatic bones

  • Orbital rim: Smooth, continuous curvature

  • Clinical utility: Ideal for assessing facial symmetry and fracture displacement

MRI appearance

T1-weighted images:

  • Cortical bone: Low signal intensity

  • Diploic marrow: Intermediate signal

  • Adjacent orbital fat: High signal

T2-weighted images:

  • Bone cortex: Low signal

  • Surrounding soft tissues: Intermediate-to-high signal

CT VRT 3D image

Zygomatic process of frontal bone3d

X Ray image

zygomatic process of frontal bone