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EXTENSOR MECHANISM OF
FINGER
LIKI PEDIA
Structures involved
 Extensor digitorum communis
 Extensor indicis proprius
 Extensor digiti minimi
 These muscles passes from the forearm to
hand beneath extensor retinaculum.
 The tendons of EDC, EIP & EDM variability on
the dorsum of hand.
 EDC tendon leads to the extensor hood.
 1EIP tendon insert into the hood of EDC.
 EDC tendon of one finger may also be
connected to adjacent finger by juncturae
tendinae.
JUNCTURAE TENDINAE
 EDC tendon of each finger is split into 3 bands
 1. Central tendon
 2. Lateral band
 3.Terminal band
1. Central band
 Inserts at the base of middle phalanx.
2. Lateral band and 3.
Terminal band
 Both the lateral band rejoins to form the
terminal band at the distal phalanx.
 EDC have two components
 Active components
 Passive components
Active components
 Dorsal interossei
 Volar interossei
 Lumbricals
 Proximal – dorsal and volar interossei arises
from the sides of metacarpal joints
 Distal – join at the extensor hood which also
wraps the EDC and also contributes the
central tendon and lateral band fibers.
 Lumbricals and interossei both together refer
to as intrinsic muscles.
Passive components
 Sagittal band
 Oblique retinacular ligament
 Triangular ligament
Sagittal band
 It helps in stabilization of lateral bands on the
dorsum of hand.
 It connects the dorsal surface of extensor
hood to the volar plate and the deep
transverse metacarpal ligament.
 Sagittal band is not only for volar plates but
also it stabilizes the hood of MCP joint.
 It prevents the bowstring of extensor
mechanism.
Oblique retinacular ligament
 Proximal – both the side of proximal phalanx
and annular and cruciate pulleys.
 Distal – distal to the distal phalangeal joint.
Triangular ligament
 Triangular ligament & sagittal bands are
interconnected by the lateral band
Identify the parts
Extensor mechanism of finger

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Extensor mechanism of finger

  • 2. Structures involved  Extensor digitorum communis  Extensor indicis proprius  Extensor digiti minimi
  • 3.  These muscles passes from the forearm to hand beneath extensor retinaculum.  The tendons of EDC, EIP & EDM variability on the dorsum of hand.  EDC tendon leads to the extensor hood.  1EIP tendon insert into the hood of EDC.  EDC tendon of one finger may also be connected to adjacent finger by juncturae tendinae.
  • 5.  EDC tendon of each finger is split into 3 bands  1. Central tendon  2. Lateral band  3.Terminal band
  • 6. 1. Central band  Inserts at the base of middle phalanx.
  • 7. 2. Lateral band and 3. Terminal band  Both the lateral band rejoins to form the terminal band at the distal phalanx.
  • 8.  EDC have two components  Active components  Passive components
  • 9. Active components  Dorsal interossei  Volar interossei  Lumbricals
  • 10.  Proximal – dorsal and volar interossei arises from the sides of metacarpal joints  Distal – join at the extensor hood which also wraps the EDC and also contributes the central tendon and lateral band fibers.  Lumbricals and interossei both together refer to as intrinsic muscles.
  • 11. Passive components  Sagittal band  Oblique retinacular ligament  Triangular ligament
  • 12. Sagittal band  It helps in stabilization of lateral bands on the dorsum of hand.  It connects the dorsal surface of extensor hood to the volar plate and the deep transverse metacarpal ligament.  Sagittal band is not only for volar plates but also it stabilizes the hood of MCP joint.  It prevents the bowstring of extensor mechanism.
  • 13. Oblique retinacular ligament  Proximal – both the side of proximal phalanx and annular and cruciate pulleys.  Distal – distal to the distal phalangeal joint.
  • 14. Triangular ligament  Triangular ligament & sagittal bands are interconnected by the lateral band