Zygomatic Arches Week 7 Fall 2011 Zygomatic Arches

Zygomatic Arches 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) _________

Causes 1. 2. 3. 4. 5. 6. Car accident Sports injury Domestic violence, child or elder abuse Blunt trauma Fall Gunshot

______ 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