investing fascia

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in·vest·ing fas·ci·a

[TA]
a (usually) relatively thin fibrous membrane, devoid of fat, which ensheaths a layer of muscles, usually derived from a single embryonic sheet, directly on their surfaces, separating individual muscles.
References in periodicals archive ?
Type 2: Beneath the investing layer of deep cervical fascia
The lower part is covered by skin, subcutaneous tissue, platysma muscle, and an investing layer of deep cervical fascia. The submandibular fascia is nonadherent and free of septa, and it can therefore be easily dissected away from the surrounding structures and the gland.