Extensor Expansion/ Extensor Hood Mechanism

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Last updated 9:38 PM on 9/25/26
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9 Terms

1
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Extensor digitorum muscle belly in…

forearm-->tendon--> MCP-->
and blends into the triangular, flat aponeurosis over the proximal
phalanx

2
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Forearm-->

tendon

3
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tendon-->

MCP

4
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MCP-->

blends into the triangular, flat aponeurosis over the proximal
phalanx

5
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Widest at the

MCP joint, secured by the sagittal bands

6
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As the ED passes over the proximal phalanx, trifurcates forming

central slip and lateral bands.

7
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Central slip continues over the..

axis inserting into the middle phalanx

8
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When it joints the PIP joint

the lumbricals and interosseous
muscles join ED over the middle or distal phalanx

9
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Referring to the aponeurosis and mechanism of digital extension
covering dorsal digits

2-5