Extensor expansion | |
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TA2 | 2502 |
Anatomical terminology |
An extensor expansion (extensor hood,[1] dorsal expansion, dorsal hood, dorsal aponeurosis[citation needed]) is the special connective attachments by which the extensor tendons insert into the phalanges.
These flattened tendons (aponeurosis) of extensor muscles span the proximal and middle phalanges.[2]
At the distal end of the metacarpal, the extensor tendon will expand to form a hood, which covers the back and sides of the head of the metacarpal and the proximal phalanx.