While a medial frontalis muscle bifurcation occurs grossly in most senescent Caucasians, muscle fibers exist microscopically within this zone in nearly half of individuals.
Dacryoadenitis can be a clinical manifestation of NK/T-cell lymphoma. To our knowledge, this is the first reported case of nasal NK/T-cell lymphoma with contralateral dacryoadenitis.
In senescent Caucasians, the OOM extends approximately 1.4 cm superior, 1.2 cm inferior, and 2.5 cm lateral to the orbital rim. The muscle extends significantly further superiorly and laterally in Caucasian men than in women. Knowledge of the extent of the OOM should improve the understanding and the treatment of conditions affecting this region.
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