Investing fascia

Deep fascia
Details
Latin	fascia profunda
Anatomical terminology []

Deep fascia (or investing fascia) is a fascia, a layer of dense connective tissue which can surround individual muscles, and also surround groups of muscles to separate into fascial compartments.

This fibrous connective tissue interpenetrates and surrounds the muscles, bones, nerves and blood vessels of the body. It provides connection and communication in the form of aponeuroses, ligaments, tendons, retinacula, joint capsules, and septa. The deep fasciae envelop all bone (periosteum and endosteum); cartilage (perichondrium), and blood vessels (tunica externa) and become specialized in muscles (epimysium, perimysium, and endomysium) and nerves (epineurium, perineurium, and endoneurium). The high density of collagen fibers is what gives the deep fascia its strength and integrity. The amount of elastin fiber determines how much extensibility and resilience it will have.

Examples include:

Deep fascia is less extensible than superficial fascia. It is essentially avascular, but is richly innervated with sensory receptors that report the presence of pain (nociceptors); change in movement (proprioceptors); change in pressure and vibration (mechanoreceptors); change in the chemical milieu (chemoreceptors); and fluctuation in temperature (thermoreceptors)., Deep fascia is able to respond to sensory input by contracting; by relaxing; or by adding, reducing, or changing its composition through the process of fascial remodeling.

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