Lab 2/Lecture 3: Midline Bones Flashcards
With a lateral strain pattern which axes are involved and which direction do the sphenoid and occiput rotate?
Rotate in same direction about 2 vertical axes
Lateral strain patterns are named for the postion of what on what?
Basi-sphenoid relative to the basi-occiput
What axes of rotation are involved in a Vertical Strain pattern and which direction do the Sphenoid and Occiput rotate?
Spehnoid and occiput rotate about 2 transverse axes in the same direction
In SBS torsion, the rotation of the SBS is along what type of axis?
This axis runs from where to where and motion is in which plane?
Sphenoid and occiput rotate in which direction?
- AP-axis –> From nasion to opisthion,
- Motion in a coronal plane
- Sphenoid and Occiput rotate in opposite directions
Which motion is occuring to the parietal and temporal bones during an SBS torsion?
ER on the side of the torsion
Which way does the mandible shift during an SBS torsion?
Toward the side of the torsion
What occurs to the size of the orbit on the side of an SBS torsion?
Smaller
SBS sidebending occurs around which axes, located where, and in which plane?
Sphenoid and occiput rotate in which directions?
- 2 vertical axes in the transverse plane
- One axis through the body of the sphenoid
- One axis through the center of the foramen magnum
- Sphenoid and occiput rotate in opposite directions on these axes
In SBS side-bending and rotation the sphenoid and occiput rotate about which axis and in which direction?
Rotation about a transverse axis and in the same direction (coronal plane)
In an SBS left side-bending/rotation, what is the rotation and sidebending findings of both the sphenoid and occiput?
- Sphenoid is SB R and rotated left
- Occiput is SB L and rotated left
What are the midline/unpaired bones of the cranium?
- Sphenoid
- Occiput
- Vomer
- Ethmoid
- Mandible
SOVEM
Cranial midline bones usually rotate about a _______ axis in a __________ direction.
Cranial midline bones usually rotate about a transverse axis in a anterior/posterior direction. –> flexion/extension
During flexion of the SBS, the crista galli of the ethmoid swings in what direction?
Supeior and posterior = flexion of the ethmoid
The ER/IR effects of the lateral masses of the ethmoid during SBS flexion/extension, is due to the pull/push of ER/IR by what?
Maxillae
During SBS extension, extension of the Ethmoid swings the crista galli in which direction?
Inferior and Anterior
Lymphatic backup due to ethmoid SD or sinusitis may contribute to headaches in what 2 ways?
- Increased dural tension, which may be tied to migraine and/or tension HA
- Vascular effects, which may lead to migraine symptomatology
What are 3 clinical considerations tied to the Ethmoid?
- Sinusitis –> lateral masses move into ER and open nasal passages
- Septal deviation -> ethmoid spine allows for lateral deviation (i.e., breathing thru 1 nostril)
- Headache –> lymph draining thru cribiform plate
Vertical strains are named by the direction of?
Basisphenoid
In SBS torsion the motion of the sphenoid and occiput occurs about what axis and in what direction?
Motion happens in opposite directions about an AP axis
Which axes are involved in SBS lateral strain and which direction to the sphenoid and occiput rotate in relation to each other?
- 2 vertical axes: one thru foramen magnum + one thru body of sphneoid
- Sidebending (aka spin) of the occiput and sphenoid occurs in same direction
For SBS sidebending rotation which axes exist for each movement and how do the sphenoid and occiput move in relation to eachother on each?
- Sidebending: 2 vertical axes… sphenoid and occiput spin in opposite directions
- Rotation: 1-AP (sagittal) axis… sphenoid and occiput spin in same direction
