Are the Ethmoidal Foramina Through the Frontal Bone, Ethmoid Bone, or Frontoethmoidal Suture?

Area of Science:

• Anatomy
• Surgical Anatomy
• Orbital Anatomy

Background:

• The ethmoidal foramina (anterior, middle, and posterior) are key anatomical landmarks within the medial orbital wall.
• Variations in the location of these foramina and their relationship to the frontoethmoidal suture can impact surgical procedures in the orbital region.

Purpose of the Study:

• To precisely locate the anterior, middle, and posterior ethmoidal foramina.
• To classify their positional relationship to the frontoethmoidal suture in adult human skulls.

Main Methods:

• Analysis of 120 adult human skull sides, excluding those with damaged medial orbital walls.
• Recording and classifying the number and types (I, II, III) of ethmoidal foramina based on their position relative to the frontoethmoidal suture.

Main Results:

• A total of 192 ethmoidal foramina were identified across the analyzed skulls.
• Type II foramina (on the suture) were most common (61.7%), followed by Type I (38.3%). No Type III foramina (inferior to the suture) were observed.
• A higher incidence of Type I foramina was noted compared to previous reports.

Conclusions:

• The study highlights significant variations in ethmoidal foramen location, particularly an increased incidence of Type I.
• Awareness of these anatomical variations is critical for surgeons operating on the medial orbital wall to prevent inadvertent injuries.
• A thorough understanding of orbital anatomy and its variations is essential for improving surgical outcomes and patient safety.