Anatomy of facial bones Flashcards Preview

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Flashcards in Anatomy of facial bones Deck (11):

there are ___ facial bones



facial bones

  • create the shape and form of a persons face
  • they help to form the orbits, nose, and mouth
  • all of the bones are "paired" except for the vomer and the mandible


the maxillae

  • the paired maxillae (maxillary) bones are the second largest immovable bones of the face
  • the maxillae help to form the orbits, nasal cavity and mouth
  • they are fused at the midline just below the nasal septum
  • each maxilla articulates with the frontal and ethmoid bones, and 7 facial bones


each maxilla

  • consists of a body and four processes
  • the body is lateral to the nose
  • the frontal process forms the lateral part of the nose
  • the zygomatic process articulates with the zygoma
  • the alveolar process contains 8 upper teeth
  • contains a maxillary sinus
  • has a fourth process, the palatine process, which form the anterior portion of the roof of the mouth known as the hard palate
  • the posterior part of the hard palate is formed by the palatine bones
  • incomplete joining of the palatine processes of the maxillae is known as a "cleft palate"


palatine bones

  • each palatine bone is roughly L shaped
  • the vertical portion articulates with the maxilla and pterygoid process of the sphenoid
  • the tip of the vertical portion helps to form the orbit
  • the palatine bones articulate with the ethmoid and the sphenoid 


zygomatic bones

  • each zygoma articulates with the zygomatic process of each maxilla
  • form the prominent cheek bone
  • form the anterior portion of the zygomatic arch
  • articulate with the frontal, sphenoid, temporal and maxilla


nasal and lacrimal bones

  • these bones are the thinnest, most fragile bones in the body
  • lacrimal bones lie just posterior to the frontal processes of the maxillae and are closely associated with the tear ducts
  • the fused nasal bones form the bridge of the nose and articulate with the frontal, sphenoid, temporal and maxilla


right and left inferior nasal conchae

  • the superior and middle nasal conchae are part of the ethmoid bone but inferior nasal conchae are seperate facial bones
  • the three sets of conchae divide the nasal cavity into compartments
  • air is warmed and cleaned when it flows around the conchae and comes in contact with the mucosal linings of the nasal cavity
  • the cribriform plate and crista galli help to seperate the cranial cavity from the nasal cavity


bony nasal septum

  • the midline bony nasal septum is formed by the ethmoid and the vomer (means "plowshare")
  • the vomer has furrows for blood vessels which is often the origin of nosebleeds and associated with trauma
  • if the nasal septum is displaced laterally it is known as a "deviated nasal septum". this usually occurs at the junction of the septal cartilage and the vomer, and if it is severe it can affect breathing


the mandible

  • the largest single facial bone
  • the only movable bone in the head
  • each angle or gonion is the point of division between the ramus (pl. rami) and the body
  • the lower teeth are anchored in the alveolar process (or ridge) of the mandible


what is the angulation difference between OML and IOML

7 degrees