Virtually any muscle mass invested in fascia is at risk, given the right conditions. Upper Extremity
The upper arm has an anterior and a posterior compartment. The anterior compartment contains the biceps-brachialis muscle and the ulnar, median, and radial nerves (Fig 270-1). The posterior compartment contains the triceps muscle. Fortunately, the compartments of the upper arm are relatively roomy, and compartment syndromes are uncommon in this location. The forearm has volar and dorsal compartments that are further subdivided into smaller compartments by investing fascia at mid-forearm (Fig, 2.7.0.-2). The volar compartment contains wrist and finger flexors, and the dorsal compartment contains wrist and finger extenders. The hand has thenar and hypothenar compartments, containing the intrinsic muscles of the thumb and little finger, respectively. The interosseous muscles of the hand are contained in their own compartments (F,,i,g...,,2.7.,0:.3).
FIG. 270-1. The biceps-brachialis (anterior) and triceps (posterior) compartments of the right arm.
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