Extensor expansion

Extensor expansion

Infobox Anatomy
Name = Extensor expansion
Latin =
GraySubject =
GrayPage =


Caption = Tendons of forefinger and vincula tendina. (Extensor expansion not labeled, but region is visible.)


Caption2 =


MapPos =
MapCaption =
Precursor =
System =
Artery =
Vein =
Nerve =
Lymph =
MeshName =
MeshNumber =
DorlandsPre =
DorlandsSuf =
An extensor expansion (dorsal expansion, dorsal hood) is an anatomical term that refers to the flattened tendons (aponeurosis) of extensor muscles that run into the back of the hand.

It spans the proximal and middle phalanges.cite web |url=http://www.emedicine.com/plastic/topic324.htm |title=eMedicine - Hand, Tendon Lacerations: Extensors : Article by D Glynn Bolitho, MD, PhD, FACS |accessdate=2008-01-20 |format= |work=]

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:
* Two 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,cite book |author=Kyung Won, PhD. Chung |title=Gross Anatomy (Board Review) |publisher=Lippincott Williams & Wilkins |location=Hagerstown, MD |year=2005 |pages=43 |isbn=0-7817-5309-0 |oclc= |doi=] 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

External links

*
*


Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • Extensor carpi ulnaris muscle — Extensor carpi ulnaris Posterior surface of the forearm. Extensor carpi ulnaris labeled in purple at center right. Latin musculus extensor carpi ulnaris …   Wikipedia

  • Extensor retinaculum of the hand — The mucous sheaths of the tendons on the back of the wrist. (Dorsal carpal ligament labeled at bottom center.) Latin retinaculum musculorum extensorum manus Gray s …   Wikipedia

  • Extensor digiti minimi muscle — Muscle infobox Name = Extensor digiti minimi Latin = musculus extensor digiti minimi GraySubject = 125 GrayPage = 451 Caption = The mucous sheaths of the tendons on the back of the wrist. (Extensor digiti quinti proprius labeled at center left.)… …   Wikipedia

  • Extensor digitorum longus muscle — The mucous sheaths of the tendons around the ankle. Lateral aspect. (Extensor dig. longus labeled at upper right.) Latin musculus extensor digitorum longus …   Wikipedia

  • Extensor hallucis longus muscle — Infobox Muscle Name = PAGENAME Latin = musculus extensor hallucis longus GraySubject = 129 GrayPage = 481 Caption = The mucous sheaths of the tendons around the ankle. Lateral aspect. (Ext. hall. long. labeled at upper left.) Caption2 = Cross… …   Wikipedia

  • expansion — 1. An increase in size as of chest or lungs. 2. The spreading out of any structure, as a tendon. 3. An expanse; a wide area. [L. ex pando, pp. pansus, to spread out] clonal e. (klo′nal) production of daughter cells all arising originally from a… …   Medical dictionary

  • dorsal digital expansion — extensor expansion a triangular aponeurotic extension of the digital extensor tendon on the dorsum of the proximal phalanx of each digit, to which the tendons of the lumbrical and interosseous muscles are also attached; it forms a movable hood… …   Medical dictionary

  • extensor aponeurosis — see under expansion …   Medical dictionary

  • extensor hood — see under expansion …   Medical dictionary

  • Common extensor tendon — Posterior surface of the forearm. Superficial muscles. (Common extensor tendon not labeled, but region is visible at upper right.) The common extensor tendon is a tendon shared by a number of extensor muscles in the forearm. It attaches to the… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”