Every term.
Plainly defined.

An adhesion is where fascial tissue has become stuck to adjacent tissue, limiting movement and creating a pull across the body. Think of it like plastic wrap that has folded over on itself. Once stuck, it transmits tension to areas far from the original site.

Why it matters: adhesions are often the root cause of pain that "moves around." The tightness in your shoulder might be pulling from an adhesion in your upper back.

The part of your nervous system that regulates automatic functions: heart rate, breathing, digestion, and the stress response. Fascia is densely innervated by autonomic nerve fibers, which is why emotional stress and trauma often show up as physical tension in the body.

Why it matters: releasing the fascia can directly influence the nervous system. Sustained pressure activates a parasympathetic (rest and digest) response, calming the whole system.

The primary structural protein in fascia and the most abundant protein in the human body. Collagen fibers give fascia its tensile strength. When fascia dehydrates or becomes restricted, collagen fibers mat together and lose their organized, sliding structure.

Why it matters: collagen is responsive to sustained mechanical pressure. This is the biological basis for myofascial release - pressure over time reorganizes the collagen matrix.

Pain lasting more than 3 months, often without a clear structural cause on imaging. The fascial system is increasingly recognized as a primary driver of chronic pain that doesn't show up on MRIs - because fascia is largely invisible to standard imaging.

Why it matters: if you've been told "nothing is structurally wrong" but you're still in pain, fascia is often the missing piece of the explanation.

The thickening and stiffening of fascial tissue, often in response to repetitive stress, injury, or prolonged poor posture. Densified fascia loses its ability to glide and becomes a source of stiffness, pain, and restricted movement.

Why it matters: densification is reversible. Sustained pressure, movement, and hydration can restore the normal texture and glide of fascial tissue over time.

The dense, organized layer of fascia that surrounds and separates muscles, tendons, and bones. Unlike superficial fascia (which lies just under the skin), deep fascia transmits mechanical forces across large distances. The thoracolumbar fascia - the deep fascia of the lower back - influences everything from hip movement to shoulder function.

A continuous, three-dimensional web of connective tissue that surrounds, supports, and connects every muscle, bone, organ, and nerve in the body. It is the organ that holds everything else in place. Fascia is made primarily of collagen and water, and it responds to mechanical pressure, movement, and hydration.

Why it matters: fascia was largely ignored by anatomists for decades. It's been called "the Cinderella tissue" - everywhere, essential, overlooked. Understanding it changes how you understand pain, posture, and movement.

An area where fascia has lost its normal elasticity and glide, creating a fixed zone of tension that pulls on surrounding structures. A restriction in one area can create symptoms in a completely different part of the body - because fascia is one continuous system, not a collection of separate parts.

Why it matters: this is why treating where it hurts often doesn't solve the problem. The source of the restriction is frequently elsewhere.

The primary cell type in fascia. Fibroblasts produce collagen, elastin, and the ground substance that forms the fascial matrix. They also respond to mechanical forces - sustained pressure signals fibroblasts to remodel the tissue, which is the cellular mechanism behind fascial release.

A molecule found in fascial tissue that binds water and allows layers of fascia to glide smoothly over one another. When fascia becomes dehydrated or overloaded, hyaluronic acid can become viscous and sticky, causing layers that should slide to lock together.

Why it matters: hydration and movement are not optional for fascial health - they're the mechanism by which hyaluronic acid maintains its lubricating function.

The combined unit of muscle (myo) and its surrounding fascial sheath. You cannot fully separate muscle from fascia - they function as one integrated system. When we talk about myofascial release, we're working on both simultaneously.

A manual or self-applied technique that uses sustained, low-load pressure to release fascial restrictions. The key word is sustained: fascia responds to pressure held for 90 seconds or more, not to rapid friction or stretching. The tissue literally softens and reorganizes under prolonged, gentle force.

Why it matters: this is the foundation of everything we teach at Fascia.com. Understanding the 90-second rule changes how you use every tool and approach every release.

Sensory receptors embedded in fascial tissue that respond to mechanical stimuli - pressure, stretch, vibration. Fascia contains more mechanoreceptors than muscle, making it one of the richest sensory organs in the body. This is why bodywork has such a powerful effect on the nervous system.

The electrical charge produced by collagen fibers when they are compressed or stretched. Piezoelectric signals from fascial compression appear to trigger cellular repair processes - one proposed mechanism for why sustained pressure to the tissue facilitates healing and reorganization.

The body's ability to sense its own position and movement in space. Fascia is a primary organ of proprioception - it tells your brain where your body is at all times. When fascia becomes restricted or thickened, proprioceptive signals become inaccurate, contributing to poor coordination and chronic muscle guarding.

A system of hands-on soft tissue manipulation and movement education developed by Dr. Ida Rolf in the mid-20th century. Rolfing was one of the first structured approaches to working directly with fascia. Ida Rolf's core insight - that the body functions best when its segments are properly aligned within the field of gravity - remains foundational to modern fascial work.

Relating to the body as distinct from the mind - though in practice, the two are inseparable. Somatic approaches recognize that the body stores and expresses psychological experience as physical tension, posture, and movement patterns. Fascia is a primary medium for this storage.

Why it matters: this is why stress, trauma, and emotion show up in the body - and why working with the body can resolve what the mind cannot reach alone.

The loose connective tissue layer that lies just beneath the skin, above the deep fascia. It contains fat cells, blood vessels, lymphatics, and nerve endings. The superficial fascia is the layer most directly affected by hydration, temperature, and skin rolling techniques.

A structural principle in which rigid components (like bones) float within a continuous network of tension (like fascia). In a tensegrity structure, no single component bears all the load - forces are distributed throughout the whole system simultaneously. The human body is a biological tensegrity structure.

Why it matters: tensegrity explains why a restriction anywhere in the fascial network affects the whole body - and why treating isolated symptoms rarely resolves systemic pain.

The property of certain gels to become more fluid when subjected to sustained mechanical stress - and to return to a gel state when the stress is removed. Fascial ground substance is thixotropic. This is the physical basis for why sustained pressure (not rapid friction) releases fascial tissue: the gel state of the matrix temporarily liquefies under slow, sustained load.

Why it matters: this explains the 90-second rule. You have to hold long enough for thixotropy to occur. Quick pressure doesn't work because the tissue doesn't have time to liquefy and reorganize.

A hyperirritable spot within a taut band of muscle or fascial tissue that produces local and referred pain when compressed. Trigger points often refer pain to predictable, distant locations - a trigger point in the gluteus minimus, for example, can produce pain down the entire leg that mimics sciatica.