Lab 2/Lecture 3: Midline Bones Flashcards Preview

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Flashcards in Lab 2/Lecture 3: Midline Bones Deck (21)
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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?



SBS sidebending occurs around which axes, located where, and in which plane?

Sphenoid and occiput rotate in which directions?

three axes

-2 vertical-opposite rotation

-1 sagittal (AP)-same rotation


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?


- Occiput


- Ethmoid

- Mandible



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?



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?

1. Increased dural tension, which may be tied to migraine and/or tension HA

2. Vascular effects, which may lead to migraine symptomatology


What are 3 clinical considerations tied to the Ethmoid?

1. Sinusitis --> lateral masses move into ER and open nasal passages

2. Septal deviation -> ethmoid spine allows for lateral deviation (i.e., breathing thru 1 nostril)

3. Headache --> lymph draining thru cribiform plate


Vertical strains are named by the direction of?



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