Joints of right index finger

Capsule and ligaments of proximal interphalangeal joint, medial view

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Image #111-4
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Joints of right index finger
Capsule and ligaments of proximal interphalangeal joint, medial view
The extensor expansion (2) has been reflected dorsally to display the insertion of the central part of the extensor tendon (4) on the base of the middle phalanx.
1 . Phalanx I
2 . Extensor expansion (reflected dorsally)
3 . Joint capsule
4 . Common extensor digitorum muscle (insertion of central part of tendon into base of second phalanx)
5 . Phalanx II (covered by periosteum)
6 . Ligament of digital sheath
7 . Collateral ligament
8 . Fascial band continuous between cruciate part of sheath ligament and extensor expansion opposite interphalangeal joint (divided and reflected dorsally)
9 . Anterior accessory ligament
10 . Ligament of digital sheath (cruciate ligament)
11 . Articular branch of proper palmar digital artery
12 . Tendon of digital sheath
13 . Ligament of digital sheath (annular ligament)