comlex question

[garabaldi]

Can someone explain cranio-sacral motion?
I'm confused with the answers to Savarese p. 55 ( number's 3 and 4), they seem contradictory to me.

If sacral base moves anterior ( flexion) during cranial flexion ( Q3), then why is the answer ( B) in number 4. It says sacral counternutation (posterior motion) occurs during craniosacral flexion, as the sacral base moves posteriorly.

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[san5a]

go to pg. 45, top left picture of sacrum.. there are 4 physiologic sacral axis and innominates.

resp and craniosacral motion = inhale, sacrum counternutates (sacral base posterior = extend).. this corresponds to cranial flexion phase where the cranial bones expands (head gets fuller, fatter)

postural: you extend/bend backward (lordosis.. like in pregnancy) = sacral base is "pushed" anteriorly (aka nutate, or flexed )

during inhalation = sacral base posterior (think of the base being pushed back by the air in your gut)

sacral base posterior = sacral extension = sacral counternutation = during cranial flexion (head gets fuller) and when you bend forward (flex) sacral base will move posterior


You only need to know one kind of movement well, and the other one is the other one.
inhalation-sacral base posterior - sacral extension - craniosacral flexion - kyphosis - sacral counternutate