OCMM Midline And Paired Bones

Question 1

What is the motion of the occiput, sphenoid, ethmoid and vomer?

Answer 1

Rotate about a transverse axis, flexion and extension

Question 2

What are the 4 parts of the ethmoid bone?

Answer 2

Cribiform plate, perpendicular plate, 2 lateral masses

Question 3

Which 5 bones does the vomer articulate with?

Answer 3

Sphenoid, ethmoid, septal cartilage, maxillae and palatines

Question 4

The sphenoid drives what?

Answer 4

Vomer motion

Question 5

What happens to the ethmoid and vomer when the SBS is in flexion?

Answer 5

The ethmoid will move in the same direction as the occiput and the vomer will move in the same direction as the sphenoid

Question 6

Which way do midline bones move?

Answer 6

Flexion/extension; normally rotate about a transverse axis in a anterior/posterior direction

Question 7

Which way do paired bones move?

Answer 7

Internal/external rotation; usually move about AP axis in a lateral motion (coronal plane), labeled external/internal rotation (flexion-extension)

Question 8

What 5 other bones does the parietal bone articulate with?

Answer 8

Occiput, frontal, sphenoid, temporal and opposite parietal

Question 9

Which sutures are present in the parietal bone?

Answer 9

Sagittal, coronal, parietosquamous, parietomastoid, lambda, sphenoparietal

Question 10

Which bones in the only one that contacts all 4 fontanelles?

Answer 10

The parietal bone

Question 11

What does the temporal bone articulate with?

Answer 11

Occiput, parietal, sphenoid, zygoma, mandible

Question 12

Which sutures are present on the temporal bone?

Answer 12

Occipitomastoid, sphenotemporal, parietosquamous, parietomastoid, temporozygomatic, TMJ

Question 13

The eustachian tube exits between which two bones?

Answer 13

Sphenoid and temporal bones

Question 14

Which muscles attach to the temporal bone?

Answer 14

Splenius capitus, longissimus capitus, digastric, STC, stylohyoid, styloglossus, masseter

Question 15

What does the frontal bone articulate with?

Answer 15

Parietals, sphenoid, zygoma, lacrimals, ethmoid, maxillae, nasals

Question 16

Sphenoid flexion and extension moves which bone?

Answer 16

The frontal bones

Question 17

What is the axis for torsion?

Answer 17

Sagittal (AP); motion of the sphenoid and occiput happens in opposite directions about the axis

Question 18

Torsions are named for what?

Answer 18

The higher greater wing of the sphenoid

Question 19

Sidebending rotations are named for what?

Answer 19

Named for the convexity developed in the cranium

Question 20

Which axes are involved in sidebending rotation?

Answer 20

One sagittal axis (AP; motion happens in the same direction about this axis) and two axes are vertical (superior-inferior; motion happens in opposite directions)

Question 21

What is a vertical strain named for?

Answer 21

The direction of the base of the sphenoid

Question 22

What are the axes involved in vertical strains?

Answer 22

Two transverse (horizontal); motion happens in the same direction about these axes

Question 23

What are lateral strains named for?

Answer 23

Name for the direction of the base of the sphenoid

Question 24

Which axes are involved in lateral strains?

Answer 24

Two vertical; motion happens in the same direction about these axes

Question 25

What is a compression?

Answer 25

Occurs on a sagittal axis (AP); due to significant trauma, depression or anxiety; may mimic other strain patterns

Question 26

How does SBS flexion influence the sacrum?

Answer 26

Pulls up on the dural sleeve of the cord (attaches at the occiput and S2), sacral base moves posteriorly, called counternutation

Question 27

How does SBS extension influence the sacrum?

Answer 27

Sacral nutation; nutation means nodding (forward towards the nuts)

Question 28

Where would trauma occur to cause a sidebending rotation?

Answer 28

Directly at the SBS

Question 29

Where would trauma occur to cause a lateral strain?

Answer 29

Anterior or posterior to the SBS

Question 30

Where would trauma occur to cause a vertical strain?

Answer 30

Superior or inferior force anterior or posterior to the SBS

Question 31

Where would trauma occur to cause torsion?

Answer 31

Rotational force anterior or posterior to the SBS