title: Incidence of extensor digitorum brevis manus muscle.
abstract: The extensor digitorum brevis manus, a supernumerary muscle in the fourth extensor compartment of the dorsum of the wrist, is a relatively rare anomalous muscle. Extensor digitorum brevis should be included in the differential diagnosis of soft tissue masses on the dorsal aspect of the hand as it may mimic cystic, neoplastic, inflammatory, and infectious masses arising in the dorsum of the wrist. Seventy-two upper limbs of male and female cadavers were dissected and examined to study the pattern of extensor tendons of the index finger. In the present study, we observed three cases (4.2%) of the extensor digitorum brevis manus on the left side. In one cadaver (0.72%), there was an additional tendon arising from the extensor indices which was inserted to the radial side of the dorsal digital expansion of the index finger. The extensor digitorum brevis manus muscle (EDBM), an anatomic variant of the extensor muscle of the dorsum of the hand, is found in approximately 2% to 3% of the population. This variation is, therefore, clinically and surgically relevant because the EDBM may be the only muscle responsible for the independent extension of the second digit. The aim of the present study is to report the incidences of this muscle thereby creating awareness of its existence and of its characteristic appearance to surgeons.
authors.affiliation: Department of Anatomy, CBS, Kasturba Medical College, Bejai, Mangalore, Karnataka 575004, India. anuranade@yahoo.co.in
authors.forename: Anu V
authors.initials: AV
authors.lastname: Ranade
authors.forename: Rajalakshmi
authors.initials: R
authors.lastname: Rai
authors.forename: Latha V
authors.initials: LV
authors.lastname: Prabhu
authors.forename: V
authors.initials: V
authors.lastname: Rajanigandha
authors.lastname: Prakash
authors.forename: Jiji P
authors.initials: JP
authors.lastname: Janardhanan
authors.forename: Lakshmi
authors.initials: L
authors.lastname: Ramanathan
authors.forename: M D
authors.initials: MD
authors.lastname: Prameela
references.citation: Anat Histol Embryol. 2002 Apr;31(2):126-7
references.pmid: 12047249
references.citation: J Hand Surg Am. 1995 Jan;20(1):27-34
references.pmid: 7722260
references.citation: Clin Anat. 1995;8(6):391-8
references.pmid: 8713158
references.citation: Orthop Rev. 1988 Sep;17(9):867-9
references.pmid: 3174226
references.citation: J Hand Surg Am. 1983 Sep;8(5 Pt 1):578-82
references.pmid: 6630933
references.citation: Handchir Mikrochir Plast Chir. 1999 Jan;31(1):61-5
references.pmid: 10080065
references.citation: J Hand Surg Br. 1999 Oct;24(5):575-8
references.pmid: 10597935
references.citation: Union Med Can. 1964 Dec;93:1556-7
references.pmid: 14255516
references.citation: Clin Anat. 2002 Jun;15(4):286-92
references.pmid: 12112357
references.citation: Eur J Orthop Surg Traumatol. 2002 Jan;12(3):158-60
references.pmid: 24573895
references.citation: J Hand Surg Am. 1995 Jan;20(1):35-7
references.pmid: 7722261
references.citation: AJR Am J Roentgenol. 1995 Jun;164(6):1477-9
references.pmid: 7754896
references.citation: Dermatol Online J. 2003 Dec;9(5):21
references.pmid: 14996394
references.citation: J Hand Surg Am. 1980 Jan;5(1):53-7
references.pmid: 6245125
references.citation: J Hand Surg Am. 1999 May;24(3):449-55
references.pmid: 10357521
references.citation: Clin Orthop Relat Res. 1972 Mar-Apr;83:84-6
references.pmid: 5014834
references.citation: Br J Surg. 1966 Sep;53(9):821-3
references.pmid: 5911774
references.citation: J Hand Surg Am. 1987 Jan;12(1):100-7
references.pmid: 3805622
references.citation: Clin Anat. 2006 Mar;19(2):112-4
references.pmid: 16283647
references.citation: Br J Plast Surg. 1998 Mar;51(2):128-30
references.pmid: 9659118
references.citation: J Hand Surg Am. 1991 Nov;16(6):1141-5
references.pmid: 1748763
references.citation: Hand. 1979 Jun;11(2):217-23
references.pmid: 488800
references.citation: Handchirurgie. 1981;13(1-2):52-5
references.pmid: 7343435
references.citation: J Hand Surg Am. 1987 Mar;12(2):293-4
references.pmid: 3559091