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Zygomatic process of temporal bone

The zygomatic process of the temporal bone is a slender, arched bony projection that extends anteriorly from the lower part of the squamous portion of the temporal bone. It forms a significant part of the zygomatic arch (cheekbone) by articulating with the temporal process of the zygomatic bone. This process serves as an important anatomical landmark, providing attachment for the masseter muscle and contributing to the lateral wall and floor of the temporal fossa. Its integrity is vital for normal facial contour and masticatory function.

Synonyms

  • Temporal zygomatic process

  • Zygomatic arch (when combined with the zygomatic bone's process)

  • Zygomatic extension of temporal bone

  • Processus zygomaticus ossis temporalis (Latin)

MRI Appearance

  • Proton Density (PD) Sequence

    • The zygomatic process appears as a low-signal-intensity (dark) linear or curvilinear structure due to its cortical bone composition.

    • Adjacent soft tissues and marrow within the temporal bone may demonstrate intermediate signal intensity.

  • Short Tau Inversion Recovery (STIR) Sequence

    • The cortical bone of the zygomatic process remains hypointense (dark), as STIR suppresses fat and highlights fluid.

    • The marrow space, if present, may show variable signal depending on the degree of fatty infiltration or edema.

    • Useful for detecting adjacent soft tissue pathology or bone marrow edema (in trauma or infection).

  • T1-Weighted Sequence

    • The zygomatic process displays uniformly low signal intensity due to dense cortical bone.

    • Fatty marrow, if visible within the adjacent temporal bone, appears hyperintense (bright).

    • Provides clear anatomical delineation between bone and soft tissue structures.

MRI images

Zygomatic process of temporal bone mri