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Stress in the Modern Age: Impact on Homeostasis and What You Can Do (Part 1)
In 1926, Hans Selye first used the word stress in a biological context, referring to the nonspecific response of the body to any demand placed upon it.
Why DCs Need to Understand the Principles of "Inclusive Design"
In the past few columns, I've written about the negative effects of prolonged sitting at work. I've attempted to make the point that prolonged sitting (or prolonged standing) takes a toll on workers. Now let's discuss a related issue: the concept of "inclusive design."
Successful Strategies in Integrating Acupuncture and Shiatsu in a Hospital Oncology Program
Colleagues from the Network of Researchers in Public Health in CAM recently published an article of interest to our Traditional Asian Medicine community.
News in Brief
Hamm Elected New President of the ACA; WFC / ACC 2014 Education Conference: Call for Papers; F4CP Recognizes Standard Process as $1 Million Supporter; Texas Chiro. College Begins Search for New President; League of Chiropractic Women Hosts Women's Success Summit.
Are You Guilty of Paternalism in Your Approach to Patient Care?
Einstein is purported to have said, "When a man sits with a pretty girl for an hour, it seems like a minute. But let him sit on a hot stove for a minute and it's longer than any hour. That's relativity." In some way, everything is relative to one's point of view.
One and Done: Keeping Patients From Vanishing After Just One Appointment
What happened to my 3:30 p.m. ROF? They may have rescheduled, but there are two common answers no one wants to hear: 1) "She called to cancel. I tried to get her to reschedule, but she refused." 2) "She no-showed.
Get That Shoulder to Move: Restoring Internal Rotation
How many times have you mobilized, performed ART, Graston, FAKTR and PIR, and stripped a patient's posterior capsule, yet on re-exam, discovered it was still blocked?
What is a Discipline in Medicine?
In my now prolonged dialogue with physicians, one question emerges with enough regularity to deserve mention and naming: what is a discipline?
Green Tea Catechins Lower PSA, Other Biomarkers in Men With Localized Prostate Cancer
A 2006 study (Cancer Research) was the first human investigation to show that green tea catechins (GTC) are highly effective in reversing premalignant prostate lesions (high-grade prostate intra-epithelial neoplasia), an established precursor to prostate cancer.
Creating Child-Friendly Clinics with ABT
The Zurich Dojo was scattered with toy ducks, dolls, trains, exercise balls and teddy bears during my recent pediatric workshop.
Monoculture of the Mind: Part II
Cases are built within boundaries. Such bounds may be a program, event, activity or individuals. In this instance, a medical case has boundaries that include clinical interactions that are comprised of history, signs, symptoms, diagnoses, treatment plans and treatments.
Collaboration for a Cause
The Patient Protection and Affordable Care Act strongly encourages the formation of multidisciplinary practitioner teams called Patient Centered Medical Homes (PCMHs) and Accountable Care Organizations (ACOs).
Flexion-Intolerant Lower Back Pain (Pt. 3): Mobilization & Soft-Tissue Treatment
What is the biggest challenge to the chiropractor in treating discogenic pain? You have to completely reframe the purpose of your manipulation. It is rarely about unlocking a stuck segment at the disc involvement level; it is not about putting a joint back in alignment.
AAAOM – The Beginning of the End (Part II)
In 2012, the AAAOM board members met in Chicago for their annual meeting. The goal was to come to a consensus on a long list of issues the AAAOM needed to work on including a functional board and budget.
Steven Rosenblatt: Birthing A Cross-Cultural Acupuncture Profession
The existence of a cross-cultural acupuncture profession in the United States, one that is legalized, licensed, supported by formalized, academic training and inclusive of non-Asian practitioners, is an important part of the medical landscape in this country and is responsible for improving the lives of hundreds of thousands of Americans.
Leaving a Lasting Legacy: Donna Liewer
For the past 31 years, Donna Liewer has been on a personal mission "to comfort the afflicted and afflict the comfortable." In her role as executive director of the Federation of Chiropractic Licensing Boards, Liewer has accomplished that and much, much more.
Chiropractic Prevents ADHD? Research Shows...
Now that I have your attention, let me tell you what the latest study actually states. As you may have noticed, research over the past few years has begun to reveal that acetaminophen (the primary ingredient in Tylenol) is not as safe as once thought.
Epigenetics: The Western Science Supporting Essence
Since the days of Darwin, western medicine has touted that our genes were set in stone, that our genetics were our destiny. We were told that the diseases that ran in our family were likely coming to us as well.
The Healing Properties of Light: An Interview With Researcher Anna Cocliovo
This interview is with Anna Cocliovo, a light researcher and Acupuncturist in Arizona. During my own research in light, I came across the article she published for the American Journal of Acupuncture and sought her out as a result.
Resilience is the New Longevity
Sometimes we must enter a room through one door and not another, even though they both lead into the same space. I am talking now of the recent cachet with the concept of "resilience" regarding health, chronic pain and longevity.
Risk Factors for Heel Problems
Heel pain and gait disability are common occurrences in adults, often the result of thinning heel pads and a lifetime of exposure to heel-strike shock. One condition experienced by many people is plantar fasciitis.
November, 2008, Vol. 08, Issue 11
The Pressurestat Model Explains the Craniosacral Rhythm
By John Rollinson, D. Eu, CST-D; guest author for John Upledger, DO, OMM
The Pressurestat Model illustrates the mechanism behind the circulation of cerebrospinal fluid through the semi-closed, hydraulic craniosacral system.Originally defined by Dr. John Upledger and a team of researchers at Michigan State University in the 1970s, the model explains the palpable, rhythmic expansion and contraction of the craniosacral system.
The brain and spinal cord are surrounded by cerebrospinal fluid (CSF). This fluid transports nutrients, hormones and peptides. It removes metabolic waste and toxic substances. It serves as a shock absorber, floating the brain to counteract gravity. It even influences respiration and cerebral blood flow, among its many functions. Given all this, it's easy to see how essential it is for CSF to flow unimpaired. If an area of brain tissue is even partially deprived of optimal CSF motion and flow, that area will be forced into some degree of functional compromise.1
Cerebrospinal fluid is held within the dural membrane that surrounds the brain and spinal cord. This tough, watertight sac takes the shape of the interior of the cranium and intervertebral canal. Though dura mater doesn't stretch much, this fluid container is flexible and allows for CSF pressure changes. When pressure increases, the dural membrane expands, and the bones of the cranium and sacrum move along with it. When pressure decreases, the reverse occurs.
This filling of the craniosacral system is known as flexion, and the emptying is known as extension. During flexion, the head becomes wider transversely and shorter in its anterior-posterior dimension. The whole body externally rotates and widens. After flexion, this motion passes through a neutral zone on its way into extension, during which the head narrows and elongates and the whole body internally rotates.
Under normal circumstances, the craniosacral system proceeds cyclically through flexion and extension at a rate of about six to 12 cycles per minute. We can feel this rhythm at various places on the body because "this whole-body response is probably due to the pumping effect of the cerebrospinal fluid upon the motor system ... which causes a rhythmical tonification and detonification of the myofascial system in response to rhythmically fluctuating nerve signals."2
Tracing the Flow of Cerebrospinal Fluid Through the Craniosacral System
So, we have a hydraulic system that surrounds the brain and spinal cord. To understand how it is semi-closed, we must first understand how CSF enters and leaves the system. Within the ventricles of the brain, you'll find a capillary network - the choroid plexus - that produces CSF. In essence, blood circulating through the choroid plexus is "turned into" CSF, which then enters the craniosacral system.
The choroid plexus has stretch- and compression-sensing receptors within the saggital suture of the cranium. As CSF is added to the craniosacral system and its volume increases, the dural container expands, spreading the bones of the head. The parietal bones then move apart and spread the saggital suture. When this happens, the whole neuromechanism signals the choroid plexus to stop or greatly reduce the production of CSF. As the fluid drains from the system, the dura and cranium shrink and the parietals come together, compressing the saggital suture. The pressure-sensing nerve endings connected to the choroid plexus then send a signal to resume CSF production and the cycle repeats.
Normally, the system seems to operate on a cycle of about six seconds; CSF is produced for about three seconds and then production ceases for about three seconds. This creates the rhythmical rise and fall of fluid pressure within the system.
From the lateral ventricles, CSF enters the third ventricle via the foramina of Monro, then the fourth ventricle via the cerebral aqueduct. The CSF then enters the subarachnoid space and the central canal of the spinal cord via the foramina of Luschka and of Magendie, where it joins the CSF that is already bathing the brain and spinal cord, and all neural tissue enclosed by the dura mater. The fluid then circulates down and around the spinal cord and up and around the brain.
Cerebrospinal fluid passes out of the semi-closed hydraulic system via folds - called arachnoid granulation bodies or arachnoid villae - of the arachnoid layer of the cranial meninges that project through the inner layer of dura mater into the venous sinuses of the brain.3 CSF is reabsorbed into the venous blood through these arachnoid villae, which are primarily in the saggital venous sinous.
Although the rate of reabsorption is fairly constant, it seems to be regulated (think of a car idling) by a cluster of arachnoid granulation bodies found at the anterior end of the straight sinus. From its position at the "crossroads" of the intracranial membranes, this cluster can become aware of any tension within the membrane system and may regulate the outflow of CSF accordingly.
To summarize in a different way, the craniosacral system is like a leaking toilet with the tank cracked into pieces and lined with a giant exam glove (which is the dural membrane). The float-switch in the toilet tank is the saggital suture, which causes an inflow whenever enough water/CSF leaks away down the drain (sinuses).
Generating Whole-Body Effects
The craniosacral system is intimately related to the nervous, musculoskeletal, vascular, lymphatic, endocrine and respiratory systems. Just as abnormalities in the structure or function of any of these systems can influence the craniosacral system, abnormalities in or injuries to the structure or function of the craniosacral system can have profound and deleterious effects on the development or function of the nervous system, especially the brain.4
There are also ways in which the craniosacral system directly influences important, ongoing physiological processes. For instance, the continuing rhythmical movement of the system may serve to "milk" the pituitary gland and affect the neuroendocrine system. The rhythmic motion may also be an important stimulus for the development of the brain. Similarly, the motion around the skull sutures may pump the newly formed red blood cells out of the flat bones of the skull and into the general circulation.5
Of course, any abnormality of the craniosacral system could impact the body or any of its parts through the central nervous system. Any deficiency in circulation of CSF could affect brain and nerve functioning. Any restriction of nerves passing out of the craniosacral system due to restrictions in the cranial sutures or membranes may affect their end organs. Thanks to the Pressurestat Model, we can see why.
Click here for previous articles by John Upledger, DO, OMM.
John Rollinson practices full-time in Northampton, Mass., and at several school clinics in the area. You can contact him at www.rosetrust.org.
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