Applied anatomy and oral surgery for dental students . described more or less indetail: sphenoid, ethmoid, maxilla, and mandible. The Sphenoid Bone.—The sphenoid bone (Fig. 7)is situated across the base of the skull, between the tem-poral bones laterally, the ethmoid bone in front, andthe occipital bone behind. The sphenoid bone consists of a body and six processes,three on each side, viz.: the greater wing, the lesser wing,and the pterygoid process. The hody is cuboid in upper and lateral surfaces are within the posterior surface articulates with the occipital
Applied anatomy and oral surgery for dental students . described more or less indetail: sphenoid, ethmoid, maxilla, and mandible. The Sphenoid Bone.—The sphenoid bone (Fig. 7)is situated across the base of the skull, between the tem-poral bones laterally, the ethmoid bone in front, andthe occipital bone behind. The sphenoid bone consists of a body and six processes,three on each side, viz.: the greater wing, the lesser wing,and the pterygoid process. The hody is cuboid in upper and lateral surfaces are within the posterior surface articulates with the occipital anterior surface forms part of the roof of the nose,,and presents the sphenoid turbinated bones and theopenings of the sphenoid sinuses, which are situatedwithin the body of the bone. The inferior surface alsoforms part of the roof of the nose and posterior wall ofthe nasopharynx. The greater wing presents three surfaces—internal orcerebral, external or temporozygomatic, and orbital,which assists in forming the outer wall of the orbit BOXES 19. The lesser wing extends outwardly from the anteriorportion of the body, and has two surfaces. The supe-rior surface assists in forming the anterior fossa of thebrain-case, and the inferior sur-face is part of the roof of theorbit. The pterygoid process projectsdo\\Tiward from the junction ofthe greater wing with the bodyof the bone. It consists of aninternal plate and an externalplate, separated by the pterygoidfossa. The lower extremity ofthe internal pterygoid plate—the hamular process—assists informing the bony framework ofthe roof of the mouth. The Ethmoid Bone.—The eth-moid bone (Fig. i) is situatedbetween the orbits at the anteriorpart of the brain-case, and formsd portion of the anterior fossa ofthe skull. It is cuboid in shape,and consists of a vertical or per-pendicular plate, a horizontal orcribriform plate, and two lateralmasses. The vertical or perpen-dicular plate is in the medianline, in an anteroposterior direc
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Keywords: ., bookauthoriv, bookcentury1900, bookdecade1910, booksubjectanatomy
