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Core Tendon Guard Reflex (CTG)
The idea of Tendon Guard Reflexes ties into how the body reflexively protects its musculoskeletal system during stress or trauma. The Core Tendon Guard (CTG) is often described as a full-body freeze response, but we can also conceptualize distinct regional tendon guard responses, each serving a specific role in protecting different parts of the body. These responses may indeed follow a hierarchical order of development, from basic, whole-body protective mechanisms in early life to more specific, fine-tuned responses in later development. Each regon will have seleted points that ae more effetive to move through spastic tissue so this is representative only. CTG is worth an entire class on its own.
While this can seem overwhelming, CTG is more accessible when broken down into horizontal and vertical pathways, starting with the body’s retinacula in the trunk. In The Endless Web, Schultz and Feitis (1996) define the retinaculum as a specialized thickening of the fascia—a ‘retaining band’ that functions to hold underlying structures in place, acting as a crucial interface between the longitudinal flow of muscles and the transverse stability of the joints. These structures serve as the primary stabilizers for the body’s internal ‘sleeves.’
For adults, this involves unraveling the Sinew channels; the outer layers must release before accessing the deep internal rotators at the Jueyin level. These deep muscles contract and pull inward to protect the ‘viscera’—which includes the brain and spinal cord—creating a ‘corset’ effect that squeezes top-to-bottom and inward.
Practitioners already know these points; acupuncture points sit on top of most major retinacula of the trunk. The focus remains on major biomechanical hinge zones where vectors change—specifically the cervical area, T3, T8, and L2—as well as the hips and knees. These areas create strong flexion commands to protect the midline and the central nervous centers.
The clinical significance of these biomechanical hinge zones lies in their impact on the vagus nerve. The vagus will not effectively cross a chronic flexion pathway; both afferent sensory and efferent motor signaling become deeply diminished. When these pathways remain obstructed long-term, it triggers a form of ‘synaptic pruning.’ The brain begins to diminish or ‘map out’ the pathways that are no longer responsive, reinforcing the freeze state at a neurological level.
