Cranila Midline Bones Flashcards
What are the midline/unpaired bones of the cranial base
Sphenoid occiput
What the the midline /unpaired bones of the face
Ethmoid, mandible, vomer
What are the paired bones of the cranial vault
Parietal, temporal, squamous temporal
What are te paired bones of the face
Inferior nasal concha Lacrimal Maxilla Nasal Palatine Zygoma
Midline bone motion
Rotate around a transverse axis in an anteriorposterior direction (even when it is labeled flexion-extension)
Paired bone motion
Usually move about AP axis ina. Lateral option (coronal plane), labeled external rotation.internal rotation (flexion-extension)
What is flexternal rotation
Flexion and extension
SBS inhalation motion
Flexion
Sphenoid will rotate about a transverse axis so that the alae will move anteriorly and the motion at the SBS will be superior
Occiput will rotate about a transverse axis so that the motion at the SBS will be superior and the bowl of the occiput will move posterior and inferior
What bones does the ethmoid atach to
Frontal, sphenoid, vomer, maxillary, palatine, nasal
What are the 4 parts of the ethmoid
Horizontal (cribriform plate)-includes crista galli
Perpendicular plate
2 lateral masses (form the orbital plates which are part of the medial walls of the orbits, forms the middle and superior concha)
Flexion of the ethmoid
Perpendicular plate is rotated by the sphenoid about its transverse axis-this swings the crista galli superiorly and psoteriorly
External rotation effects-the lateral masses of the expand inferiorly, using their attachments to the cribriform plate as a hinge due to the pull of external rotation of the maxilla
Extension ethmoid
-perpendicular plate is rotated by the sphenoid about its transverse axis-the swings of the crista galli inferiorly and anteriorly
Internal rotation effects-the lateral masses of the compress inferiorly, using their attachments the cribriform plate as a hinge due the pouch of internal rotation of the maxilla
Sinusitis
Lateral masses move as paired bones, into external rotation with widening of the ethmoid notch and external rotation of the maxilla..opening the nasal passage
The IR/ER effects on the ethmoid create a pumping action on the ethmoid sinus and contribute to the pumping action of the other sinuses
Septal deviation
The ethmoid spine (hinge-like area where the perpendicular plate joins the cribriform plate) allows some lateral deviation, as when an individual is breathing through only one nostril
Headache
Theoretically, 30% of CSF drains through the lymphatic system, with the most significant portion of that draining through the cribriform plate. Lymphatic backup due to ethmoid somatic dysfunction or sinusitis may contribute to : increased dural tension, which may be tied to migraine and or tension headache OR vascular effects which may lead to migraine sympotmatology
What does the sphenoid widen to contact
Sphenoid
Vomer flexion
Wide flare palate
Vomer extension
Narrow tall plate
Function vomer flexion
Depresses the hard palate with SBS flexion
Vomer flexion posterior part and anterior part
Posterior part depresses the palatines, flattening the roof of the mouth
Anterior part ascends to allow premaxillary to externally rotate
when SBS is in flexion, what do ethmoid and vomer do
Ethmoid will move in same direction as the occiput
The vomer will move in the same direction as the sphenoid
Vowels move together, consonants move together
SD vomer clinical
Secondary to the position of sphenoid usually trauma to the face
The palatines follow the __ into IR and ER
Maxillae
ER palatine
Horizontal plate moves laterally and inferiorly
Flexion palate flattens
