Week 7 Fall 2011 Zygomatic Arches: Anatomy 1. Prominent process called Zygomatic process 2. Projects anteriorly 3. Articulates with zygoma Anatomy of Zygomatic Articulations 1) _________________ 2) _________________ 3) _________________ 4) _________________ 5) _________________ Indications 1. _____________________ 2. _____________________ 3. _____________________ Causes 1. 2. 3. 4. 5. 6. Car accident Sports injury Domestic violence, child or elder abuse Blunt trauma Fall Gunshot _____________________ _______ ________ ________ and ________ ___________ Fractures _____________ Zygomatic Arches Isolated Zygomatic Arch Fractures Where is the fracture? Name this fracture: Name this fracture: Name this fracture: Common Projections for Zygomatic Arches • SMV • Tangential: oblique inferosuperior • Modified Towne: AP Axial 1. Positioning: • _______________ 2. Lines and planes: • _______________ • _______________ 3. CR: • _______________ _______________ SMV for Zygomatic Arches 1. Zygomatic arches free from overlying structures 2. No rotation as indicated by symmetric arches w/o foreshortening 3. Mandibular symphysis SI frontal bone SMV Radiograph Zygomatic Arches SMV Radiograph and Diagrams Tangential Projection ____________________ Zygomatic arches 1. Positioning: • • ____________________ 2. Lines and planes: • • ____________________ ____________________ 3. CR: • ____________________ ____________________ Tangential Radiograph for Zygomatic arches 1. Zygomatic arch free from overlying structures 2. Zygomatic arch not overexposed 3. Collimate tightly Tangential Anatomy Tangential Obliques 1. Positoning: • __________________ 2. Lines and Planes: • __________________ 3. CR: • • • ___________________ OML: ___ caudad IOML ___ caudad Modified Towne: AP Axial Zygomatic Arches 1. No overlap of zygomatic arches by mandible 2. No rotation as evident by symmetric arches 3. Arches projected lateral to mandibular rami Modified Towne Zygomatic Arches Modified Towne Anatomy