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Can anyone explain why the sacral bases move anterior in the "bilateral sacral flexion" dysfunction. Doesn't the sacrum move posterior in flexion?
Don't confuse craniosacral flexion with anatomic flexion. CSF happens about the superior axis of the sacrum and during CS flexion the base counternutates (moves posteriorly). In the anatomical sacrum dysfunction called bilateral sacral flexion, the sacrum flexes (base moves anterior) about the middle axis. 2 distinct kinds of motion about 2 different axes.Can anyone explain why the sacral bases move anterior in the "bilateral sacral flexion" dysfunction. Doesn't the sacrum move posterior in flexion?
BoomJust use the top of the sacrum as your point of reference, if the top nods "F"orward (anterior) then its flexion. Yes the bottom moves back but thats not where your assessing since you are looking at ILAs which are near the top.
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Don't confuse craniosacral flexion with anatomic flexion. CSF happens about the superior axis of the sacrum and during CS flexion the base counternutates (moves posteriorly). In the anatomical sacrum dysfunction called bilateral sacral flexion, the sacrum flexes (base moves anterior) about the middle axis. 2 distinct kinds of motion about 2 different axes.
I think he was confused because in "cranio-sacral flexion" (which arguably doesn't exist) the sacrum base/superior portion moves posterior. They call it counternutation to avoid it being confused with actual sacral flexion.Just use the top of the sacrum as your point of reference, if the top nods "F"orward (anterior) then its flexion. Yes the bottom moves back but thats not where your assessing since you are looking at ILAs which are near the top.
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I think he was confused because in "cranio-sacral flexion" (which arguably doesn't exist) the sacrum base/superior portion moves posterior. They call it counternutation to avoid it being confused with actual sacral flexion.
Just use the top of the sacrum as your point of reference, if the top nods "F"orward (anterior) then its flexion. Yes the bottom moves back but thats not where your assessing since you are looking at ILAs which are near the top.
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Future OMM fellow right here!
To specify, head gets fuller during cranial flexion in this case means the Left-Right diameter increases, but the A-P diameter decreases (according to the texts). Some think of it like Ernie's head (from Sesame Street) or a football head.Just memorize:
CS flexion = sphenoid moves anterior = occiput moves posterior = paired bones go into external rotation = head gets fuller and moves caudal = sacrum counternutates (extends - it does what the occiput does)
If you know that, you can figure out the motion of everything else in the ridiculous cranial questions.
To specify, head gets fuller during cranial flexion in this case means the Left-Right diameter increases, but the A-P diameter decreases (according to the texts). Some think of it like Ernie's head (from Sesame Street) or a football head.
When you say the bones move caudal, I'm guessing you are referring to the wings of sphenoid and the bowl of the occiput. However, it is important to note that base of the sphenoid and occiput (parts of the the sphenobasilar synchondrosis or SBS) moves cephalad which pulls on the dura and its attachment to the sacrum pulling the sacrum in to counternutation.