Lab 2/Lecture 3: Midline Bones

Question 1

With a lateral strain pattern which axes are involved and which direction do the sphenoid and occiput rotate?

Answer 1

Rotate in same direction about 2 vertical axes

Question 2

Lateral strain patterns are named for the postion of what on what?

Answer 2

Basi-sphenoid relative to the basi-occiput

Question 3

What axes of rotation are involved in a Vertical Strain pattern and which direction do the Sphenoid and Occiput rotate?

Answer 3

Spehnoid and occiput rotate about 2 transverse axes in the same direction

Question 4

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?

Answer 4

• AP-axis –> From nasion to opisthion,
• Motion in a coronal plane
• Sphenoid and Occiput rotate in opposite directions

Question 5

Which motion is occuring to the parietal and temporal bones during an SBS torsion?

Answer 5

ER on the side of the torsion

Question 6

Which way does the mandible shift during an SBS torsion?

Answer 6

Toward the side of the torsion

Question 7

What occurs to the size of the orbit on the side of an SBS torsion?

Answer 7

Smaller

Question 8

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

Sphenoid and occiput rotate in which directions?

Answer 8

three axes

• 2 vertical-opposite rotation
• 1 sagittal (AP)-same rotation

Question 9

In SBS side-bending and rotation the sphenoid and occiput rotate about which axis and in which direction?

Answer 9

Rotation about a transverse axis and in the same direction (coronal plane)

Question 10

In an SBS left side-bending/rotation, what is the rotation and sidebending findings of both the sphenoid and occiput?

Answer 10

• Sphenoid is SB R and rotated left
• Occiput is SB L and rotated left

Question 11

What are the midline/unpaired bones of the cranium?

Answer 11

• Sphenoid
• Occiput
• Vomer
• Ethmoid

- Mandible

SOVEM

Question 12

Cranial midline bones usually rotate about a _______ axis in a __________ direction.

Answer 12

Cranial midline bones usually rotate about a transverse axis in a anterior/posterior direction. –> flexion/extension

Question 13

During flexion of the SBS, the crista galli of the ethmoid swings in what direction?

Answer 13

Supeior and posterior = flexion of the ethmoid

Question 14

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?

Answer 14

Maxillae

Question 15

During SBS extension, extension of the Ethmoid swings the crista galli in which direction?

Answer 15

Inferior and Anterior

Question 16

Lymphatic backup due to ethmoid SD or sinusitis may contribute to headaches in what 2 ways?

Answer 16

1. Increased dural tension, which may be tied to migraine and/or tension HA
2. Vascular effects, which may lead to migraine symptomatology

Question 17

What are 3 clinical considerations tied to the Ethmoid?

Answer 17

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

Question 18

Vertical strains are named by the direction of?

Answer 18

Basisphenoid

Question 19

In SBS torsion the motion of the sphenoid and occiput occurs about what axis and in what direction?

Answer 19

Motion happens in opposite directions about an AP axis

Question 20

Which axes are involved in SBS lateral strain and which direction to the sphenoid and occiput rotate in relation to each other?

Answer 20

• 2 vertical axes: one thru foramen magnum + one thru body of sphneoid
• Sidebending (aka spin) of the occiput and sphenoid occurs in same direction

Question 21

For SBS sidebending rotation which axes exist for each movement and how do the sphenoid and occiput move in relation to eachother on each?

Answer 21

• Sidebending: 2 vertical axes… sphenoid and occiput spin in opposite directions
• Rotation: 1-AP (sagittal) axis… sphenoid and occiput spin in same direction