Cranial Strain Flashcards
midline bones
ethmoid, sphenoid, occiput, vomer, sacrum
flex/extend
paired bones
temporal parietal frontal ethmoid nasal lacrimals maxilla palatines zygoma inferior conchae mandible
external/internal rotation
“flexternal rotation”
physiologic
flexion with external rotation
and extension with internal rotation
RTM
tensegrity model
guide motion of bones
formed by dura being contiguous with periosteum of skull
vault hold
index finger - greater wing sphenoid
pinky finger - lateral angles of occiput
inferring motion at SBS by looking at these motions**
motion at SBS
named for motion of sphenoid on occiput
cranial strains
flex/extension
torsion (R or L)
sidebending (R or L)
vertical strain (sup-inf)
lateral strain (R or L)
SBS compression
physiologic strains
flex extension
torsions
sidebending
flexion
around 2 transverse axes
- level of foramen magnum
- body of sphenoid
lateral occiput (pinky) and wings of sphenoid (index) move inferiorly
basiocciput and basisphenoid move superiorly
extension
lateral occiput (pinky) and wings of sphenoid (index) move superiorly
basiocciput and basisphenoid move inferiorly
torsion
sphenoid and occiput rotate in opposite diretion around an AP axis
named by superior greater wing of sphenoid
mirrors motion of basisphenoid
torsion vault hold
one greater wing superior
opposite occipital angle superior
named for superior greater wing**
right superior greater wing
left superior occipital
right torsion
naming of torsion
the superior index finger (wing of sphenoid)
sidebending rotation
two axes
- sidebend - parallel vertical axes
- rotation - rotation
sense of convexity and inferior motion on one side
naming of sidebending rotation
side of convexity and inferior motion
left index and pinky closer together and superior
right sidebending rotation
non-physiologi strains
lateral strain (shear) vertical strain (shear) SBS compression
introduced through trauma
lateral strain
parallel vertical rotation
-both same direction
index fingers shift one way (L or R)
pinky finger shift opposite
named opposite direction
both index to left and both pinky to right
left lateral strain
lateral strain movement
direction basisphenoid moves
plagiocephaly
kids with funny looking heads
-parallelogram heads
greater wings shift to left
basisphenoid to right
right lateral strain
vertical strain
parallel transverse
-shearing force
rotation same direction
one bone flexion and the other extension
vertical strain naming
based on direction of basisphenoid
superior or inferior
wings superior, base inferior
inferior vertical strain
SBS compression
compress sphenoid occiput along A-P axis
bowling ball head
-no motion
index and pinkys approximate
