Motion of Sphenoid and Occiput Flashcards
When the sphenoid undergoes flexion, what happens?
Greater wings of sphenoid move anterior/inferior
When the sphenoid undergoes extension, what happens?
greater wings of sphenoid move posterior/superior
When the occiput undergoes flexion, what happens?
membranous portion of the occiput moves posterior/inferior
When the occiput undergoes extension, what happens?
membranous portion of occiput moves anterior/superior
During flexion, SBS moves _____
Cephalad (superior)
During extension, SBS moves _____
caudad
SBS flexion SD
-
Sphenoid and occiput move further during flexion and have less motion into extension
- OR: ease of motion is flexion; restriction of motion is to extension
SBS extension SD
The sphenoid and occiput move further during extension and have less motion in flexion
- Ease of motion is to extension and restriction of motion is to flexion
sphenoid and occiput have restriction of motion is flexion
name SD
SBS extension SD
ease of motion is to extension and restriction of motion is to flexion
sphenoid and occiput have restriction of motion to extension
SBS flexion SD
findings with SBS flexion SD
- Increased transverse diameter
- Forehead = wide and sloping;
- AP diameters the same on both sides;
- Sagittal suture flat or even slightly depressed
findings with SBS extension SD
The long, narrow head;
- decreased transverse diameter,
- AP diameter is the same in the sagittal (anterior-posterior) and coronal (left-right) plane;
- sagittal suture may be rigid
SBS flexion = sacrum ___
SBS flexion = counternutation (base moves posterior around transverse axis)
SBS extension = sacrum ___
SBS extension = sacrum nutation (base moves anterior around transverse axis)
