Extensor expansion
From Infogalactic: the planetary knowledge core
| Extensor expansion | |
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Tendons of forefinger and vincula tendina. (Extensor expansion not labeled, but region is visible.)
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| Identifiers | |
| TA | Lua error in Module:Wikidata at line 744: attempt to index field 'wikibase' (a nil value). |
| TH | {{#property:P1694}} |
| TE | {{#property:P1693}} |
| FMA | {{#property:P1402}} |
| Anatomical terminology
[[[d:Lua error in Module:Wikidata at line 863: attempt to index field 'wikibase' (a nil value).|edit on Wikidata]]]
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An extensor expansion (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.[1]
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.
Bands
The expansion soon divides into three bands:
- lateral bands pass on either side of the proximal phalanx and stretch all the way to the distal phalanx. The lumbricals of the hand, extensor indicis muscle,[2] dorsal interossei of the hand, and palmar interossei insert on these bands.
- A single median band passes down the middle of the finger along the back of the proximal phalanx, ending at the base of the middle phalanx.
- A band known as the retinacular ligament runs obliquely along the middle phalanx, and connects the fibrous digital sheath on the anterior side of the phalanges to the extensor expansion.
References
- ↑ Lua error in package.lua at line 80: module 'strict' not found.[not in citation given]
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- lesson5musofpostforearm at The Anatomy Lesson by Wesley Norman (Georgetown University)
- Hand kinesiology at the University of Kansas Medical Center
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