resourcesABOUT MT AUTHOR GUIDELINES CLASSIFIEDS EDITORIAL CALENDAR MEDIA GUIDE MASSAGE MART SCHOOLS & EDUCATION FEEDBACK
Environmental Toxins: Cause of Modern Illness (Part I)
Environmental toxins have created burdens on the human body that put demands beyond our evolutionary development. Modern diseases that historically did not exist to any great degree have been rising sharply in the last 40 years.
Revisiting the Neurological Exam
In spinal trauma or disease, the neurological exam chiefly aims to determine whether one (or more) of three basic neurological conditions is present: myelopathy, radiculopathy and peripheral nerve disorder.
No Whining on the Yacht
This admonition – no whining on the yacht – may sound familiar to you. Many claim its origination.
The Right Idea at the Right Time
On Feb. 28, 2014, Virginia Governor Terry McAuliffe appointed David Brown, DC, as new director of the Virginia Department of Health Professions.
Are You Driving Patients Toward Dependence on Big Pharma?
Over the years I have had the opportunity to talk to doctors of chiropractic about health promotion, wellness and preventive care in chiropractic practice.
Evaluating Prenatal and Pediatric Automobile Injuries
Often in a family practice, one of your patients or an entire family is in an automobile accident and you are sought out to provide care for their soft-tissue injuries.
AAAOM: Facing An Ultimatum
On the heels of the growing discontent with leaders of the AAAOM, the Council of State Associations (CSA) recently took it upon themselves to present the organization with an ultimatum: for all board members to resign from the board and turn the organization over to the CSA or they will proceed on their own to become the primary representative of the AOM profession.
Your Chance to Go Back to High School
As the father of a student who recently entered high-school sports (soccer), I have come to recognize an untapped opportunity for the chiropractic profession.
The Recliner Test
"Hi, Bill, how are you?" "Oh, I'm OK, Doc. I've got pain down the leg again, so I thought I would stop by and get you to check it."
How Much is Enough?
One of the primary arguments used against acupuncture care is the overuse of treatment. Some people say, "once you go, you have to go forever."
Dietary Supplement Research: Contradictions, Bias, Misinterpretation and Confusion
I do not care what the truth is, one way or another; I just want to know it. And when it comes to dietary supplements, the truth can be hard to find for a number of reasons.
Socializing In My Slippers
When I graduated college, I had grandiose dreams of becoming an amazing acupuncturist. I wanted to build a great practice and make a good living. For four years, 13 semesters to be exact, I had a spreadsheet.
Chiropractic Management of Sports-Related Tendinopathy
Tendinopathy is increasing in prevalence and accounts for a substantial percentage of sports injuries. Despite the magnitude of the disorder, research on chiropractic treatment is limited.
Shoulder Strategies: Reduce Pain, Improve Function With Proper Taping
Shoulder pain / dysfunction is a common problem for chiropractic patients. Clinicians who utilize elastic therapeutic taping as part of their treatment approach know it can be effective for a variety of shoulder problems.
Making Sense of Chronic Inflammation
Inflammation is big business, evidenced by not only the laundry lists of medications patients bring me aimed at managing inflammation, but also the never-ending stream of advertisements for anti-inflammatory supplements that constantly find their way to my desk.
Enhancing TCM with Enzymes
Herbal formulations are an integral component for most Traditional Chinese Medicine (TCM) practitioners. One of the best ways to enhance their effectiveness is the addition of plant-based enzymes.
Arch Height and Running Shoes: The Best Advice to Give Patients
Because runners with different arch heights are prone to different injuries, running shoe manufacturers have developed motion-control, stability and cushion running shoes for low-, neutral- and high-arched runners, respectively.
We Get Letters & E-Mail
Shouldn't the Pentagon Know More About Chiropractic Care? Office Flow: Have You Reviewed the Patient Experience Lately? Let's Stop Confusing the Public About Chiropractic; Cutting Down the Cherry Tree.
Through the Eyes of a Child
Once upon a time there was a girl name Lucy. Lucy had cancer, but she had a heart filled with love and compassion. Please come along to hear this story of an amazing child, her tenacity and her dream to help other children.
Anti-Aging: Educating Your Patients About The Skin
We know that cosmetic acupuncture works but what then? Education is a key part to the practice of Chinese medicine and when you practice cosmetic acupuncture, facial rejuvenation, etc., it is time talk about skin with your patients.
Chinese Herbs Debut at the Cleveland Clinic
Chinese herbal medicine is now being prescribed at the Cleveland Clinic thanks to a trailblazing team of people.
News in Brief
In Remembrance: A Moment of Silence for Dr. Dick Versendaal; NYCC Named Chiropractic College of the Year by ACA; National University Partners With Indiana VA Facility.
Alternatives to the Rainy Day Fund: Better Things to Do With Your Money
Google "rainy day fund" and you'll find the predominant and traditional advice given today is that you need to have three months of living expenses saved for an emergency. Some even recommend six months or more.
Dry Needling is Acupuncture: Anatomy of a Legal Victory in Oregon
On January 23, 2014, the Oregon Court of Appeals overturned the Oregon Board of Chiropractic Examiners "dry needling" administrative rule, which allowed chiropractic physicians to perform acupuncture after only 24 hours of training.
San Zhen Protocols Part II: Case Studies
In my last article, I presented a collection of three-point acupuncture combinations which can provide effective clinical results.
Colorado to Have the First Acupuncture Medical Reserve Corps in the U.S.
In the summer of 2012, Colorado was on fire. Literally. Many acupuncturists from around the state, especially those who had received disaster response training through AWB, wanted to help those affected by the fires as well as the first responders and tireless state and local officials, with the healing and stress-relief of acupuncture.
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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