Anatom3DInvesting fascia of left free upper limb
Fascia partis liberae membri superioris sinistri · Obalová fascie levé volné horní končetiny
Fascia & connective tissue
Looks like
The deep fascia sleeve of the arm below the shoulder, from upper arm to hand.
What it does
Wraps and separates muscle groups and guides their sliding.
Keeping it well
Severe pain after injury needs urgent assessment.