OCMM Midline And Paired Bones Flashcards

1
Q

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

A

Rotate about a transverse axis, flexion and extension

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2
Q

What are the 4 parts of the ethmoid bone?

A

Cribiform plate, perpendicular plate, 2 lateral masses

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3
Q

Which 5 bones does the vomer articulate with?

A

Sphenoid, ethmoid, septal cartilage, maxillae and palatines

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4
Q

The sphenoid drives what?

A

Vomer motion

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5
Q

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

A

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

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6
Q

Which way do midline bones move?

A

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

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7
Q

Which way do paired bones move?

A

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

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8
Q

What 5 other bones does the parietal bone articulate with?

A

Occiput, frontal, sphenoid, temporal and opposite parietal

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9
Q

Which sutures are present in the parietal bone?

A

Sagittal, coronal, parietosquamous, parietomastoid, lambda, sphenoparietal

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10
Q

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

A

The parietal bone

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11
Q

What does the temporal bone articulate with?

A

Occiput, parietal, sphenoid, zygoma, mandible

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12
Q

Which sutures are present on the temporal bone?

A

Occipitomastoid, sphenotemporal, parietosquamous, parietomastoid, temporozygomatic, TMJ

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13
Q

The eustachian tube exits between which two bones?

A

Sphenoid and temporal bones

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14
Q

Which muscles attach to the temporal bone?

A

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

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15
Q

What does the frontal bone articulate with?

A

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

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16
Q

Sphenoid flexion and extension moves which bone?

A

The frontal bones

17
Q

What is the axis for torsion?

A

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

18
Q

Torsions are named for what?

A

The higher greater wing of the sphenoid

19
Q

Sidebending rotations are named for what?

A

Named for the convexity developed in the cranium

20
Q

Which axes are involved in sidebending rotation?

A

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)

21
Q

What is a vertical strain named for?

A

The direction of the base of the sphenoid

22
Q

What are the axes involved in vertical strains?

A

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

23
Q

What are lateral strains named for?

A

Name for the direction of the base of the sphenoid

24
Q

Which axes are involved in lateral strains?

A

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

25
What is a compression?
Occurs on a sagittal axis (AP); due to significant trauma, depression or anxiety; may mimic other strain patterns
26
How does SBS flexion influence the sacrum?
Pulls up on the dural sleeve of the cord (attaches at the occiput and S2), sacral base moves posteriorly, called counternutation
27
How does SBS extension influence the sacrum?
Sacral nutation; nutation means nodding (forward towards the nuts)
28
Where would trauma occur to cause a sidebending rotation?
Directly at the SBS
29
Where would trauma occur to cause a lateral strain?
Anterior or posterior to the SBS
30
Where would trauma occur to cause a vertical strain?
Superior or inferior force anterior or posterior to the SBS
31
Where would trauma occur to cause torsion?
Rotational force anterior or posterior to the SBS