Cranial Adjusting San Antonio — SOT Craniopathy at Pura Vida

Most people think of the skull as a solid, fixed helmet of bone. It is not. The human skull is composed of 22 individual bones, connected by articulating joints called sutures, and those joints continue to move in adults throughout life. When they stop moving — or move incorrectly — the consequences ripple through the entire nervous system. This is the domain of SOT Craniopathy, and Dr. Dan Foss at Pura Vida Chiropractic is the only practitioner in San Antonio trained to assess and treat it at the Advanced SOT level.

What Is Cranial Adjusting (SOT Craniopathy)?

SOT Craniopathy is the cranial adjusting branch of Advanced Sacro Occipital Technique — a comprehensive system dedicated to assessing and correcting cranial bone motion, cerebrospinal fluid (CSF) flow, and the cranial rhythmic impulse (CRI). It was developed by Dr. M.B. DeJarnette, who built upon the foundational cranial osteopathy work of William Garner Sutherland, DO, and expanded it into a precise clinical system integrated with the spinal and organ dimensions of Advanced SOT.

Craniopathy is Pillar 3 of the three-pillar Pura Vida Protocol — the piece that explains why so many patients receive repeated spinal adjustments without lasting improvement. When cranial bone restrictions are present, they maintain constant tension on the dural tube — the continuous connective tissue sleeve that runs from the base of the skull to the sacrum. No matter how precisely the pelvis and spine are adjusted, if the cranium is holding the dural tube under tension, the corrections will not hold.

Reaching the Advanced SOT craniopathy skill level requires extensive post-doctoral training through SORSI (Sacro Occipital Research Society International). It is not taught in chiropractic school, and it is not available at basic or intermediate SOT certification. Dr. Dan Foss is the only practitioner in San Antonio certified at this level.

Why Cranial Bone Motion Matters

The Cranial Rhythmic Impulse (CRI)

Cerebrospinal fluid is continuously produced by the choroid plexus within the brain's ventricles and continuously reabsorbed at the arachnoid villi. This production-reabsorption cycle creates a slow, rhythmic hydraulic pressure that moves through the cranial vault and down the spinal canal — generating the cranial rhythmic impulse, a gentle motion of 6 to 12 cycles per minute that can be felt throughout the body by a trained clinician.

The CRI is a window into central nervous system health. When it is symmetrical, fluid in motion, and appropriately timed, the nervous system is operating with full hydraulic support. When cranial bone restrictions dampen or distort the CRI, the clinical consequences can be significant — and often unexpected.

Cerebrospinal Fluid — Your Brain's Lifeline

CSF does far more than cushion the brain. It delivers nutrients to neural tissue, removes metabolic waste products, and — through the glymphatic system discovered in 2012 — flushes the debris of daily neural activity, including the beta-amyloid plaques associated with neurodegeneration. The glymphatic system operates primarily during sleep, and its efficiency depends directly on unobstructed CSF flow.

When cranial bones are restricted and CRI is compromised, CSF flow decreases. Metabolic waste accumulates. Nutrient delivery slows. Neurological function suffers — not dramatically at first, but cumulatively. Patients report cognitive fog, poor sleep quality, morning headaches, and a general sense that their brain is not operating at full capacity. Restoring cranial bone motion restores the hydraulic environment the nervous system requires.

The Dural Tube — The Cranio-Sacral Connection

The dura mater is the outermost and toughest of the three meningeal layers that encase the brain and spinal cord. Critically, it forms a continuous sleeve — the dural tube — that extends from the occiput at the base of the skull all the way to the sacrum and coccyx at the base of the spine. This anatomical continuity is the foundation of the SOT model: the skull and pelvis are not two separate clinical targets. They are two ends of one connected system.

When cranial bones are restricted, tension accumulates in the dural tube and transmits that tension to every vertebral segment between the skull and sacrum. The sacrum compensates. The lumbar spine compensates. The thoracic spine compensates. This is the structural reason why adjustments that treat only the spine, without addressing the cranium, so often fail to hold — the dural tube is still under tension, pulling everything back toward the restriction pattern within days.

Conversely, when sacral dysfunction is present, it creates tension at the lower end of the dural tube, which manifests as compensatory restriction at the occiput and cranial base. Treating pelvis and cranium as a unit — Pillars 1 and 3 of the Pura Vida Protocol — is what produces structural corrections that last.

Key Cranial Structures and What They Affect

The Sphenoid Bone — The Master Bone

The sphenoid is the only cranial bone that articulates with every other bone in the cranial vault. It is the keystone of the cranial structure, and its motion is central to the function of the primary respiratory mechanism. Anatomically, the sphenoid houses the pituitary gland in a saddle-shaped depression called the sella turcica — making it the direct structural container of the master endocrine gland. The optic canals run through the lesser wings of the sphenoid, and the sphenoidal sinuses occupy its body.

Sphenoidal restriction produces a predictable clinical pattern: hormonal disruption from mechanical compression of the pituitary, vision changes, chronic pressure behind the eyes, and sinus congestion that does not respond to decongestants because it is structural, not inflammatory.

The Sphenobasilar Synchondrosis (SBS)

The junction between the sphenoid and the occiput — the sphenobasilar synchondrosis — is the most clinically significant joint in the cranium. It governs the primary respiratory mechanism and is the reference point for five classical strain patterns that Dr. DeJarnette defined and that SOT Craniopathy practitioners are trained to assess: flexion/extension, torsion, lateral strain, vertical strain, and compression. Each pattern produces a distinct clinical presentation. Correctly identifying the SBS strain pattern directs the specific cranial correction required.

The Temporal Bones

The temporal bones house the inner ear — specifically the vestibular apparatus responsible for balance and spatial orientation. The vestibulocochlear nerve (cranial nerve VIII) passes through the internal auditory meatus of the temporal bone. Temporal bone torque, one of the most common cranial dysfunctions Dr. Foss identifies, compresses the meatus and impairs CN VIII function — producing vertigo, tinnitus, a sensation of ear fullness, and in some cases measurable hearing changes.

The temporal bone also compresses the Eustachian tube when it torques inferiorly — which is why children with chronically poor temporal bone mechanics are prone to recurrent ear infections. The fluid cannot drain. The temporal bone also forms the socket (glenoid fossa) of the temporomandibular joint. Temporal bone dysfunction is among the most common undiagnosed drivers of TMJ/TMD.

The Occiput — Where Skull Meets Spine

The atlanto-occipital joint is arguably the most neurologically significant articulation in the body. The jugular foramen — the opening between the occiput and the temporal bone — is the exit point for the vagus nerve (cranial nerve X). The vagus governs heart rate, gut motility, immune regulation, and the parasympathetic tone of the thoracic and abdominal organs. Occipital restriction that compresses the jugular foramen reduces vagal output to all of these systems simultaneously.

It is also anatomically impossible to fully correct C1 (atlas) without first correcting the occiput. Practitioners who adjust the atlas without assessing occipital position are working with an incomplete picture.

The Frontal Bone

The frontal bone overlies the prefrontal cortex — the seat of executive function, attention, planning, and emotional regulation. The frontal sinuses occupy its lower portion. Restriction at the coronal suture (where the frontal bone meets the parietal bones) is commonly associated with cognitive fog, difficulty with sustained focus, sinus pressure that concentrates at the forehead, and in children, reading and learning difficulties that have a structural component often mistaken for purely neurological or developmental causes.

Conditions Treated With SOT Craniopathy

Head and Neurological Conditions Chronic headaches, migraines (especially one-sided migraines with temporal or occipital onset), post-concussion syndrome, traumatic brain injury sequelae, cognitive fog, disrupted sleep architecture, and trigeminal neuralgia. The cranial vault is the structural home of these conditions — and in many cases, the cranial component has never been assessed.

Ear, Nose, and Throat Vertigo and dizziness (particularly BPPV-like presentations with temporal bone involvement), tinnitus, a sensation of ear fullness, chronic ear infections (especially in children), Eustachian tube dysfunction, chronic sinus congestion with structural origin, and hearing changes.

Jaw and Facial TMJ and TMD dysfunction, jaw clicking and locking, facial asymmetry, tooth pain without dental cause, and maxilla dysfunction. The jaw is a cranial structure — treating it without assessing the skull bones that form its socket is treating a fraction of the problem.

Posture and Spine Forward head posture driven by airway compromise and cranial compensation, cervicogenic dizziness, spinal adjustments that will not hold, and whiplash sequelae where cranial bone trauma has not been addressed.

Pediatric Conditions Plagiocephaly (flat head syndrome from birth trauma), birth trauma sequelae (including births involving forceps, vacuum extraction, prolonged labor, or cesarean section), nursing and latching difficulty in infants, colic, infant torticollis, recurrent ear infections, and developmental and learning delays that have a structural cranial component. Under 12 months of age is the optimal treatment window for birth-related cranial compression — but improvement is possible at any age.

Hormonal and Autonomic Pituitary function (via sphenoid correction), vagal tone (via occiput and temporal correction), hormone regulation, and sleep-wake cycle disruption. The cranium is the structural chassis of the endocrine system.

Cranial Adjusting for Children — Why It Matters Early

Birth is a remarkable and physically demanding process — for the baby as much as the mother. The infant skull is designed to compress through the birth canal and re-expand after delivery. But when delivery involves interventions — forceps, vacuum extraction, prolonged pushing, or surgical delivery that bypasses the natural decompression mechanism — cranial bones can remain compressed or torqued.

The consequences are not always obvious. An infant with occipital compression may have difficulty nursing on one side. Temporal torque may predispose a child to ear infections through the first several years of life. Frontal restriction may not manifest as attention difficulty until school age. What looks like a developmental or behavioral problem in a five-year-old sometimes has its origin in a birth that happened five years earlier.

Dr. Foss's own story is part of this understanding. His childhood torticollis — a condition his parents were told required pharmaceutical management — resolved with chiropractic care that addressed the cranial and cervical component. That experience shaped his approach to pediatric care. Treatment for infants and young children is extraordinarily gentle: light fingertip contacts, no force, no manipulation. Babies routinely sleep through their cranial corrections.

What Cranial Adjusting Feels Like

Patients consistently describe SOT Craniopathy as the most relaxing part of their treatment.

There is no cracking, no impulse, no sensation of force. The doctor places light contacts on specific cranial bones and follows the rhythm of the CRI with his fingertips — using the cranial motion itself to guide the correction rather than imposing external force. The technique respects the body's own timing.

Most patients feel warmth, a subtle sense of movement or release in the skull, and a deepening relaxation that carries into the rest of the visit. Vertigo patients frequently report immediate improvement during or after treatment. Adults with chronic headaches often describe a sense of pressure releasing that they had stopped noticing because it had been present so long.

Children and infants, far from resisting the treatment, typically quiet and relax. Parents of colicky infants in particular report a remarkable change in their baby's demeanor following cranial correction.

Advanced SOT Craniopathy — Why Credentials Matter

A single weekend seminar on cranial technique is available to most licensed chiropractors. The Advanced SOT Craniopathy curriculum through SORSI is not. It covers all 22 cranial bones, the five SBS strain patterns, full CRI assessment protocols, specific techniques for the temporal bones, sphenoid, frontal bone, occiput-sacrum relationship, and dedicated pediatric protocols for birth trauma and developmental conditions. It represents years of post-doctoral study and clinical application.

"Most chiropractors have never received formal training in cranial bone assessment," Dr. Foss says. "The ones who completed a weekend seminar have a fraction of what the Advanced SOT curriculum teaches — and a fraction of the assessment tools that allow you to know which cranial bones are restricted, in which direction, and in what order to address them."

That precision is what separates a genuinely effective cranial correction from a well-intentioned approximation.

Key Takeaways

• The skull is composed of 22 individual bones that continue to move in adults — restriction in these bones has systemic neurological consequences.
• The cranial rhythmic impulse (CRI) is a measurable expression of CSF flow and central nervous system health.
• CSF delivers nutrients and removes metabolic waste — including the plaques associated with neurodegeneration.
• The dural tube connects the cranium to the sacrum: cranial restriction maintains tension throughout the entire spine, which is why spinal adjustments often fail to hold without cranial correction.
• Key cranial structures include the sphenoid (pituitary, vision, hormones), temporal bones (inner ear, TMJ, Eustachian tube), occiput (vagus nerve, C1 correction), and frontal bone (prefrontal cortex, sinuses).
• SOT Craniopathy addresses headaches, vertigo, TMJ, ear infections, post-concussion, cognitive fog, pediatric birth trauma, plagiocephaly, and hormonal/autonomic dysregulation.
• Treatment is extraordinarily gentle — no cracking, no force, and widely described as the most relaxing part of care.
• Dr. Dan Foss is the only Advanced SOT craniopath in San Antonio.

Experience Cranial Adjusting in San Antonio

If you suffer from headaches that won't resolve, vertigo, TMJ dysfunction, or adjustments that simply don't hold — there is a strong likelihood that the cranial component of your problem has never been assessed. If you are a parent of an infant with plagiocephaly, colic, or nursing difficulty, the window for the most effective intervention is now. If you are navigating post-concussion symptoms that linger months after the injury, the skull bones displaced at impact may still be displaced.

¿Sufre de dolores de cabeza, vértigo, o problemas de mandíbula que no han mejorado con otros tratamientos? Le invitamos a descubrir si hay una causa craneal detrás de sus síntomas.

Call us at (210) 685-1994 or visit us at 2318 NW Military Hwy #103, San Antonio, TX 78231.