For Those Who Need to Know the “Why”

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Your Skull Is an Amazing Piece of Engineering

Twenty-two bones make up the adult skull.

Some protect your brain.

Others form your face.

And many of them meet at structures called sutures.

If you've ever looked at a skull and noticed the jagged lines running across it, you've seen them.

Those aren't cracks.

Good news.

They're supposed to be there.

What Exactly Is a Cranial Suture?

A suture is a type of fibrous joint.

Instead of having the large movement available at a joint like your shoulder or knee, neighboring skull bones are joined by dense connective tissue.

Some of the major cranial sutures include:

Coronal suture

Between the frontal and parietal bones.

Sagittal suture

Running along the top of the skull between the two parietal bones.

Lambdoid suture

Between the parietal bones and occipital bone toward the back of the skull.

Squamous suture

Between the temporal and parietal bones on the side of the skull.

There are several others as well.

Together they create an extraordinarily strong protective structure.

Which is probably what you want wrapped around your brain.

Do Adult Skull Bones Move?

This is where cranial therapy can become confusing.

Sometimes cranial techniques are explained by saying that the bones of the adult skull continually move in a large rhythmic pattern and that practitioners can feel this movement and reposition individual bones.

The scientific evidence doesn't support describing it that simply.

Adult cranial sutures are very different from freely movable joints such as the shoulder.

There can be extremely small amounts of mechanical deformation within biological tissues under load, and sutures remain real anatomical structures.

But that doesn't mean the bones of an adult skull are sliding around under our fingertips.

So what are we working with?

That's actually a more interesting question.

There's More Here Than Bone

Around the cranial sutures are:

• Connective tissues

• Fascia

• Muscles

• Sensory nerves

• Blood vessels

• Periosteum covering bone

• Structures related to the jaw and upper neck

All of these can provide information to the nervous system.

And many are capable of contributing to discomfort or altered sensory input.

That gives us a much more grounded way of thinking about Cranial Suture Release.

We're providing gentle mechanical and sensory input to a very neurologically rich area.

Then we're looking for a response.

Why Does Gentle Touch Matter?

Your skin, muscles, joints and connective tissues contain sensory receptors.

Those receptors constantly send information toward your spinal cord and brain.

Pressure is information.

Movement is information.

Vibration is information.

Stretch is information.

Your nervous system receives that information and decides what to do with it.

Sometimes that changes muscle activity.

Sometimes it changes movement.

Sometimes it changes how something feels.

This is one reason a gentle technique doesn't necessarily mean that “nothing is happening.”

Your nervous system doesn't require a sledgehammer to notice something.

Thankfully.

What About the Dura?

Remember the dura from our Dural Tension Release discussion?

It matters here too.

The dura is the tough outer meningeal covering around the brain.

Inside the skull, portions of the dura are firmly associated with the inner surface of the cranial bones and have important attachments at specific anatomical locations.

That creates legitimate anatomical relationships between:

Skull → connective tissue → meninges → nervous system.

But once again, anatomy doesn't automatically prove a treatment claim.

We don't say:

“We're moving this skull bone and therefore moving your brain.”

Instead, we're interested in whether carefully applied mechanical input changes something we can observe or measure.

How Do We Decide Where to Treat?

The treatment shouldn't begin with:

“Everyone needs their cranial sutures released.”

Instead, we examine the patient.

Depending on the reason for treatment, we may look at:

Palpation

Are certain areas unusually tender or sensitive?

Muscle Tone

Are surrounding muscles guarded or asymmetric?

Jaw Function

Does opening, closing or moving the jaw change the finding?

Neck Movement

Does cranial treatment change cervical movement?

Sensory Findings

Does stimulation of a particular region change another examination finding?

Neurological Function

Do measurable neurological findings change following treatment?

And that last question is important.

Because we don't want to find something simply because we're looking for it.

We want the finding to matter.

What Does Treatment Actually Involve?

The provider identifies the region being addressed and applies gentle, controlled manual pressure.

Depending upon the technique, that may involve:

• Light sustained pressure

• Gentle traction

• Small controlled movements

• Soft-tissue techniques

• Work along a specific suture

• Treatment of nearby muscles or fascia

• Upper-cervical treatment when appropriate

• Jaw or TMJ-related treatment when relevant

The exact technique depends upon what was found during the examination.

Then comes our favorite part.

We test again.

Why Reassessment Matters

Imagine we find that turning your head to the right is limited.

We establish the baseline.

We perform Cranial Suture Release.

Then we check the movement again.

Maybe it changes.

Maybe it doesn't.

Both answers give us information.

The same principle can apply to:

• Range of motion

• Muscle tone

• Balance

• Eye movements

• Jaw movement

• Tenderness

• Neurological examination findings

• Functional tasks

The important thing isn't whether the practitioner felt something move beneath their hands.

It's whether you function differently afterward.

What Does the Research Say?

This is an area where we want to be especially clear.

Cranial sutures are real anatomy.

Their structure, development and biomechanics have been studied extensively.

Manual input can affect sensory systems.

Touch, pressure and movement provide real sensory information to the nervous system.

Manual therapy can influence pain and movement in some musculoskeletal conditions.

There is substantial research on manual therapy broadly.

But:

The traditional cranial-treatment model has not been strongly validated.

Studies have struggled to show that practitioners can reliably identify the same subtle cranial movements or “cranial rhythm.”

And clinical studies of craniosacral therapy have produced inconsistent results.

Some earlier studies reported improvements in pain and other outcomes.

More recent systematic reviews using stricter methods have found that the overall evidence does not demonstrate reliable clinical benefits across the conditions studied.

That's important.

It doesn't mean a patient cannot feel better following gentle cranial manual therapy.

It means we should be careful about why we say they got better.

Instead of claiming that we:

“Put your cranial bones back into alignment,”

we take a more measurable approach.

Our Approach

1. Assess

Identify the patient's concern and establish measurable findings.

2. Identify

Determine whether the cranial region appears relevant to those findings.

3. Treat

Apply gentle, controlled manual input to the appropriate region.

4. Reassess

Repeat the original measurements.

5. Look for Meaningful Change

Did movement improve?

Did muscle guarding change?

Did the patient's function improve?

Did the neurological finding change?

6. Decide What Comes Next

If the intervention produced a useful change, that gives us information.

If it didn't, we don't need to keep doing it simply because it's part of a protocol.

The patient gets the final vote.

What Are We Trying to Accomplish?

We're not trying to rearrange your skull.

And we're not trying to make every cranial suture move.

We're looking for opportunities to provide useful mechanical and sensory input that may help improve:

• Comfort

• Head and neck movement

• Muscle tension

• Jaw function

• Movement symmetry

• Sensory processing

• Neurological function

• Overall functional tolerance

Sometimes the most useful treatment doesn't require much force.

It requires knowing where to look, what to do, and what to measure afterward.

That's Cranial Suture Release.