Upper limb

Interosseous membrane of the forearm

Membrana interossea antebrachii

Origin

Interosseous border of radius

Insertion

Interosseous border of ulna (central band fibers run obliquely distomedially)

Function

Transfers axial compressive loads from radius (80% wrist load) to ulna (major elbow articulation); origin for deep forearm muscles

Innervation

Anterior and posterior interosseous nerves (C6–C8)

Movement & chain

Maintains interosseous space and stability during pronosupination (tautest in mid-pronation)

Palpation

Deep interosseous space, non-palpable

Clinical

Essex-Lopresti injury (radial head fracture, interosseous membrane disruption, DRUJ disruption); forearm compartment syndrome (Volkmann ischemic contracture).

Segmental innervation

C6–C8

In clinical practice

Early pronation/supination recovery, load management, and compartment monitoring

Region in the model

Upper limb