The infraspinatus muscle is innervated by the suprascapular nerve (C5-C6). This nerve originates from the upper trunk of the brachial plexus, passing through the suprascapular notch beneath the transverse scapular ligament and then traveling to supply both the supraspinatus and infraspinatus muscles. The primary action of the infraspinatus is external (lateral) rotation of the shoulder. It also plays a secondary role in stabilising the glenohumeral joint by compressing the humeral head into the
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The fascia is densely innervated with sensory nerve endings and mechanoreceptors that communicate directly with the central nervous system. When movement or force occurs, these receptors trigger neurotransmitter release—especially acetylcholine, glutamate, and substance P—to modulate tension, elasticity, and local muscle tone. This neurochemical activity helps fascia act as both a sensor and regulator of mechanical load, distributing kinetic energy smoothly across multiple muscle chains. If neur
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