J Neurol Surg B Skull Base 2012; 73(02): 132-138
DOI: 10.1055/s-0032-1301398
Original Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Anatomy of the Inferior Orbital Fissure: Implications for Endoscopic Cranial Base Surgery

Juan Carlos De Battista
1   Department of Neurosurgery, University of Cincinnati (UC) Neuroscience Institute, UC College of Medicine, Cincinnati, Ohio
,
Lee A. Zimmer
1   Department of Neurosurgery, University of Cincinnati (UC) Neuroscience Institute, UC College of Medicine, Cincinnati, Ohio
2   Department of Otolaryngology–Head and Neck Surgery, University of Cincinnati (UC) Neuroscience Institute, UC College of Medicine, Cincinnati, Ohio
,
Philip V. Theodosopoulos
1   Department of Neurosurgery, University of Cincinnati (UC) Neuroscience Institute, UC College of Medicine, Cincinnati, Ohio
,
Sebastien C. Froelich
1   Department of Neurosurgery, University of Cincinnati (UC) Neuroscience Institute, UC College of Medicine, Cincinnati, Ohio
,
Jeffrey T. Keller
1   Department of Neurosurgery, University of Cincinnati (UC) Neuroscience Institute, UC College of Medicine, Cincinnati, Ohio
3   Mayfield Clinic, Cincinnati, Ohio
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Publikationsverlauf

22. Juni 2011

11. Oktober 2011

Publikationsdatum:
06. Februar 2012 (online)

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Abstract

Considering many approaches to the skull base confront the inferior orbital fissure (IOF) or sphenomaxillary fissure, the authors examine this anatomy as an important endoscopic surgical landmark. In morphometric analyses of 50 adult human dry skulls from both sexes, we divided the length of the IOF into three segments (anterolateral, middle, posteromedial). Hemotoxylin- and eosin-stained sections were analyzed. Dissections were performed using transnasal endoscopy in four formalin-fixed cadaveric cranial specimens (eight sides); three endoscopic approaches to the IOF were performed. IOF length ranged from 25 to 35 mm (mean 29 mm). Length/width of the individual anterolateral, middle, and posteromedial segments averaged 6.46/5, 4.95/3.2, and 17.6/ 2.4 mm, respectively. Smooth muscle within the IOF had a consistent relationship with several important anatomical landmarks. The maxillary antrostomy, total ethmoidectomy approach allowed access to the posteromedial segment of the fissure. The endoscopic modified, medial maxillectomy approach allowed access to the middle and posterior-medial segment. The Caldwell-Luc approach allowed complete exposure of the IOF. The IOF serves as an important anatomic landmark during endonasal endoscopic approaches to the skull base and orbit. Each of the three segments provides a characteristic endoscopic corridor, unique to the orbit and different fossas surrounding the fissure.