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Anatomic Moment: Osseous Anatomy of the Pterygopalatine Fossa

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Anatomic Moment: Osseous Anatomy of the Pterygopalatine Fossa Anatomic Moment Osseous Anatomy of the Pterygopalatine Fossa David L. Daniels, Leighton P. Mark, John L. Ulmer, Mahmood F. Mafee, Jim McDaniel, Nirav C. Shah, Scott Erickson, Lowell A. Sether, and Safwan S. Jaradeh The pterygopalatine fossa (PPF) represents a major dicular plate is variably contoured and fuses with the pathway of spread of malignancy and infection from medial surface of the medial pterygoid plate (Fig 3). the head and neck into the skull base. The ability to At the upper part of the perpendicular plate, pro- precisely locate tumor and infection on CT and MR cesses are present that fuse with the maxillary and imaging studies is crucial for performing biopsies and sphenoid bones. The orbital process extends supero- planning treatment. laterally to attach to the posterior margin of the Determining the exact margins of the PPF is prob- orbital surface of the maxillary bone and partly to the lematic, because they are not strictly defined even in inferior surface of the body of the sphenoid bone the anatomic literature. The obliquely oriented upper (Figs 3A and B, and 5B and C). The sphenoidal part of the perpendicular plate of the palatine bone process extends superomedially to attach to the base and the pterygoid process form a small pyramidal- of the medial pterygoid plate (Figs 3A and B, and 4B shaped fossa that probably was called the PPF be- and E). At the junction of the perpendicular and cause it contains the pterygopalatine ganglion (1) (Fig horizontal plates, the pyramidal process attaches to 1B and C). However, axial CT studies define a larger the maxillary bone and extends posterolaterally to fossa, which incorporates the pyramidal-shaped fossa attach to the angled inferior margins of the pterygoid and has its posterolateral margin at the lateral edges plates (Figs 2A; 4B, C, and E; and 5B and C). of the base of the pterygoid process and the fused The sphenoid bone also has a unique configuration. pterygoid plates (Fig 1C and D). By conventional The pterygoid process of the sphenoid bone, posi- usage and in this article, this larger fossa is designated tioned inferior to the body and greater wing, consists the PPF (2). of the base and the medial and lateral pterygoid The PPF is bounded posteriorly by the fused ptery- plates (Fig 4B). The anterior surface of the base goid plates and the base (root) of the sphenoid bone, forms a shallow recess whose medial margin follows medially and more superiorly anteromedially by the the curve of the medial pterygoid plate (Fig 4C). This palatine bone, and anteriorly by the maxillary bone recess forms most of the posterior wall of the PPF and (2–10) (Figs 2–5). When viewed laterally, the PPF contains the anterior openings of the foramen rotun- appears as a narrow and inferiorly tapering space dum superiorly and the vidian (pterygoid) canal me- contiguous with the more anteriorly positioned infe- dially (Fig 4C). More inferiorly, the separated ptery- rior orbital fissure and formed by the gap between the goid plates attach to the pyramidal process of the curving margins of the maxillary and sphenoid bones palatine bone (Fig 4C and E). (Fig 2A and C). This gap is bridged inferiorly and Tumor and infection can extend through the PPF medially by the palatine bone. via the orbital apex, the inferior orbital fissure, the The palatine bone has a unique configuration made foramen rotundum (which allows access to the cav- up of different parts that enable it to fuse anteriorly ernous sinus), the vidian canal (leading to the fora- with the maxillary bone and posteriorly and superiorly men lacerum), the pterygomaxillary fissure (which with the sphenoid bone. The palatine bone has a communicates with the masticator space), the greater shape like a right angle when viewed frontally, owing and lesser palatine canals and foramina, and the to its horizontal and perpendicular plates (Fig 4B). sphenopalatine foramen (providing access to the pos- The horizontal plates of each palatine bone unite in terosuperior part of the nasal fossa). The pterygomax- the midline to form the posterior third of the hard illary fissure, the lateral opening of the PPF, has a palate, which fuses with the palatine processes of the well-defined posterior margin formed superiorly by maxillary bones to form the complete hard palate (Fig the lateral margin of the anterior surface of the base 6C). The perpendicular plate fuses anteriorly with the of the pterygoid process and inferiorly by the fused rough posterior surface of the medial wall of the pterygoid plates, and a not as well-defined anterior maxillary bone, thus covering part of the maxillary margin, owing to the curving contour of the posterior hiatus of the maxillary sinus. Posteriorly, the perpen- wall of the maxillary sinus (Fig 2C). The greater From the Departments of Radiology (D.L.D., L.P.M., J.L.U., J.M., N.C.S., S.E.), Cellular Biology and Anatomy (L.A.S.), and Neurology (S.S.J.), Medical College of Wisconsin, Milwaukee; and the MRI Center, University of Illinois at Chicago (M.F.M.). Address reprint requests to David L. Daniels, MD, Department of Radiology, Medical College of Wisconsin, Froedtert Memorial Lutheran Hospital, 9200 W Wisconsin Ave, Milwaukee, WI 53226. © American Society of Neuroradiology 1423 1424 DANIELS AJNR: 19, September 1998 THE CONVENTIONAL PPF * Vidian Canal A B C Base of Pterygoid Perpendicular Plate Lateral Part of Conventional PPF Process of Palatine Bone Conventional PPF D Pterygomaxillary * Fissure Maxilary Bone Base of Pterygoid Perpendicular Plate of Conventional PPF ‘98 Process Palatine Bone FIG 1. Frontal views (A–C) and axial CT scan (D) through the pterygoid process. B, The palatine bone is in position and with the pterygoid process forms a small fossa that is hidden in this view. C, The palatine bone has been removed to show this small fossa (asterisk) that was probably called the PPF because it contains the pterygopalatine ganglion (not shown), which overlies the vidian canal, shown in A. However, by conventional usage, a larger fossa incorporating the small fossa and extending to the lateral edge of the base of the pterygoid process (as shown in B, C, and D)is designated the PPF. D, At this level, the margins of the PPF (consisting of the maxillary bone, angled upper part of the perpendicular plate of the palatine bone, and base of the pterygoid process) are shown with the latter two forming the small fossa. Also evident and by conventional usage is the lateral opening of the PPF, the pterygomaxillary fissure (dotted line). AJNR: 19, September 1998 ANATOMIC MOMENT 1425 SUPERIOR LATERAL VIEW ANTERIOR POSTERIOR PTERYGOPALATINE FOSSA INFERIOR A SPHENOID BONE- Medial-Pterygoid Plates MAXILLARY BONE- Lateral- Frontal Process PALATINE BONE- Margin of Inferior Pyramidal Process Orbital Fissure PALATINE BONE- Margins of Medial Orbital Process Wall of PPF Sphenopalatine Notch B Sphenoidal Process Smooth Surface Rough Surface Greater Palatine Groove Attaches to Medial Pterygoid Plate Pyramidal Process PALATINE BONE MAXILLARY BONE Margin of Inferior Orbital Fissure C SPHENOID BONE- Greater Wing Posterior Margin of Pterygomaxillary Fissure Pterygoid Plates- -Fused -Separated ‘98 Pyramidal Process FIG 2. Lateral views of the sphenoid, palatine, and maxillary bones. A, Shown in the intact skull is the curving gap between the sphenoid and maxillary bones, consisting of the PPF and its lateral opening, the pterygomaxillary fissure (arrows) and the more anteriorly positioned inferior orbital fissure. B, To form the anterior margin of the medial wall of the PPF, the rough surface of the palatine bone is shown attaching to the posteromedial surface of the maxillary bone. More inferiorly, the anterior surface of the pyramidal process of the palatine bone attaches to the maxillary bone. The medial wall of the PPF tapers inferiorly. C, Completing the PPF, the medial surface of the medial pterygoid plate attaches to the most posterior part of the perpendicular plate of the palatine bone. More inferiorly, the pyramidal process fuses with the angled inferior margins of the pterygoid plates. The pterygomaxillary fissure is formed anteriorly by the maxillary bone, posteriorly by the lateral edge of the base of the pterygoid process, and inferiorly by the fused pterygoid plates. The margins of the pterygomaxillary and inferior orbital fissures are shown in white. 1426 DANIELS AJNR: 19, September 1998 MEDIAL Sphenopalatine Foramen VIEW Orbital Process A Sphenoidal Process SPHENOID BONE PALATINE BONE MAXILLARY BONE SUPERIOR PALATINE BONE- Orbital Process POSTERIOR ANTERIOR Air Cell Sphenopalatine Notch Ethmoidal Crest Sphenoidal Process INFERIOR Perpendicular Plate B Conchal Crest Horizontal Plate MAXILLARY BONE- Frontal Process C Maxillary Hiatus Groove Rough Surface Palatine Process Incisive Canal SPHENOID BONE- Sella Turcica ‘98 Body Sinus Pterygoid Plates-Lateral -Medial Hamulus FIG 3. Medial views of the sphenoid (shown in part), palatine, and maxillary bones. A, Overview of the lateral wall of the nasal fossa. B, The conchal crest on the medial surface of the palatine bone is contiguous with the inferior turbinate (not shown) and may be identified on coronal CT scans to locate the palatine bone (see Fig 7D). Also shown is the sphenopalatine notch marginated by the orbital and sphenoidal processes. It forms the sphenopalatine foramen when closed by the sphenoid bone (see Fig 7D). C, To bridge the gap between the sphenoid and palatine bones, the perpendicular plate of the palatine bone attaches to the anterior part of the medial surface of the medial pterygoid plate and the posterior rough surface of the medial wall of the maxillary bone covering the posterior part of the maxillary hiatus. Shown is the groove at the posteroinferior aspect of the medial wall of the maxillary bone that forms part of the wall of the greater palatine canal.
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