Ext tendon teaching Notes | EduRev

Created by: Kamran Nasir

: Ext tendon teaching Notes | EduRev

 Page 1


EXTENSOR TENDONS
EXTENSOR TENDONS
Anatomy, Mechanism and Injuries Anatomy, Mechanism and Injuries
Page 2


EXTENSOR TENDONS
EXTENSOR TENDONS
Anatomy, Mechanism and Injuries Anatomy, Mechanism and Injuries
Extensor tendons at the wrist
Extensor tendons at the wrist
  As they course under the extensor retinaculum, As they course under the extensor retinaculum, extensor tendons of the wrist and extensor tendons of the wrist and 
hand are divided into 6 compartments at the dorsal wrist, each c hand are divided into 6 compartments at the dorsal wrist, each containing ontaining 
specific tendons. specific tendons.
Page 3


EXTENSOR TENDONS
EXTENSOR TENDONS
Anatomy, Mechanism and Injuries Anatomy, Mechanism and Injuries
Extensor tendons at the wrist
Extensor tendons at the wrist
  As they course under the extensor retinaculum, As they course under the extensor retinaculum, extensor tendons of the wrist and extensor tendons of the wrist and 
hand are divided into 6 compartments at the dorsal wrist, each c hand are divided into 6 compartments at the dorsal wrist, each containing ontaining 
specific tendons. specific tendons.
Deep Intrinsic Tendon
I: Lateral MC base
Superficial tendon
- Medial merge to Central band
- Lateral merge to Collateral band
Function Extend IP
Lumbricals 
O: FDP proximal to A1
I: Intrinsic tendon
Palmar Intrinsics (Unipennate)
Dorsal Intrinsics (Bipennate)
INTRINSIC TENDONS
Page 4


EXTENSOR TENDONS
EXTENSOR TENDONS
Anatomy, Mechanism and Injuries Anatomy, Mechanism and Injuries
Extensor tendons at the wrist
Extensor tendons at the wrist
  As they course under the extensor retinaculum, As they course under the extensor retinaculum, extensor tendons of the wrist and extensor tendons of the wrist and 
hand are divided into 6 compartments at the dorsal wrist, each c hand are divided into 6 compartments at the dorsal wrist, each containing ontaining 
specific tendons. specific tendons.
Deep Intrinsic Tendon
I: Lateral MC base
Superficial tendon
- Medial merge to Central band
- Lateral merge to Collateral band
Function Extend IP
Lumbricals 
O: FDP proximal to A1
I: Intrinsic tendon
Palmar Intrinsics (Unipennate)
Dorsal Intrinsics (Bipennate)
INTRINSIC TENDONS
Central Band
O: EDC
I: Middle phalanx base
Collateral band
O: Central band
Joined by lateral band
I: Distal phalanx (terminal tendon)
EXTRINSIC TENDONS
Page 5


EXTENSOR TENDONS
EXTENSOR TENDONS
Anatomy, Mechanism and Injuries Anatomy, Mechanism and Injuries
Extensor tendons at the wrist
Extensor tendons at the wrist
  As they course under the extensor retinaculum, As they course under the extensor retinaculum, extensor tendons of the wrist and extensor tendons of the wrist and 
hand are divided into 6 compartments at the dorsal wrist, each c hand are divided into 6 compartments at the dorsal wrist, each containing ontaining 
specific tendons. specific tendons.
Deep Intrinsic Tendon
I: Lateral MC base
Superficial tendon
- Medial merge to Central band
- Lateral merge to Collateral band
Function Extend IP
Lumbricals 
O: FDP proximal to A1
I: Intrinsic tendon
Palmar Intrinsics (Unipennate)
Dorsal Intrinsics (Bipennate)
INTRINSIC TENDONS
Central Band
O: EDC
I: Middle phalanx base
Collateral band
O: Central band
Joined by lateral band
I: Distal phalanx (terminal tendon)
EXTRINSIC TENDONS
Sagittal band
Transverse volar plate attachments
Retinacular ligament
Transverse to Central tendon
Oblique to Terminal tendon
Intertendinous expansions
-Triangular ligament
-Arciform fibres
-Tendinous junctures
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