Flexor pollicis brevis muscle: Difference between revisions
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{{Short description|Muscle in the thenar compartment}} |
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{{Muscle infobox | |
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{{Anatomy terms}} |
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{{Infobox muscle |
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GraySubject = 126 | |
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GrayPage = 461 | |
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| Greek = |
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Image = Musculusflexorpollicisbrevis.png | |
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| Image = 1121 Intrinsic Muscles of the Hand Superficial sin.png |
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| Caption = Superficial muscles of the left hand, palmar view. |
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| Origin = [[Trapezium bone|Trapezium]], [[Flexor retinaculum of the hand|flexor retinaculum]] |
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| Insertion = [[Thumb]], [[Proximal phalanges|proximal phalanx]] |
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| Action = Flexes the thumb at the first [[metacarpophalangeal joint]] |
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| Antagonist = [[Extensor pollicis longus muscle|Extensor pollicis longus]] and [[Extensor pollicis brevis muscle|brevis]] |
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Blood = [[Superficial palmar arch]]| |
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| Blood = [[Superficial palmar arch]] |
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| Nerve = [[Recurrent branch of the median nerve]], [[deep branch of ulnar nerve]] (medial head) |
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MeshName = | |
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MeshNumber = | |
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DorlandsPre = m_22 | |
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DorlandsSuf = 12549129 | |
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The '''flexor pollicis brevis''' is a muscle in the hand that flexes the thumb. It is one of three [[thenar muscles]].<ref name=":0">{{Citation|last1=Fernández-de-las-Peñas|first1=César|title=8 - Deep dry needling of the arm and hand muscles|date=2012-01-01|url=http://www.sciencedirect.com/science/article/pii/B9780702046018000086|work=Trigger Point Dry Needling|pages=107–118|editor-last=Dommerholt|editor-first=Jan|place=Oxford|publisher=Churchill Livingstone|language=en|doi=10.1016/b978-0-7020-4601-8.00008-6|isbn=978-0-7020-4601-8|access-date=2020-10-25|last2=Iglesias|first2=Javier González|last3=Gröbli|first3=Christian|last4=Weissmann|first4=Ricky|editor2-last=Fernández-de-las-Peñas|editor2-first=César}}</ref><ref name=":1">{{Citation|last=Strickland|first=James W.|title=Chapter 2 - Anatomy and Kinesiology of the Hand|date=2006-01-01|url=http://www.sciencedirect.com/science/article/pii/B9780323031868500058|work=Hand Function in the Child (Second Edition)|pages=21–44|editor-last=Henderson|editor-first=Anne|place=Saint Louis|publisher=Mosby|language=en|doi=10.1016/b978-032303186-8.50005-8|isbn=978-0-323-03186-8|access-date=2020-10-25|editor2-last=Pehoski|editor2-first=Charlane}}</ref> It has both a superficial part and a deep part. |
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The '''flexor pollicis brevis''' is a muscle in the hand that flexes the thumb. It is one of three [[thenar muscles]]. It has both a superficial part and a deep part. |
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==Origin and insertion== |
==Origin and insertion== |
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The muscle's superficial |
The muscle's superficial head arises from the distal edge of the [[flexor retinaculum of the hand|flexor retinaculum]] and the tubercle of the [[Trapezium (bone)|trapezium]], the most lateral bone in the distal row of [[carpal bones]].<ref name=":0" /> It passes along the radial side of the tendon of the [[Flexor pollicis longus muscle|flexor pollicis longus]]. |
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The deeper (and medial) |
The deeper (and medial) head "varies in size and may be absent."<ref name="Gray37th630p">Gray's 37th British Edition, p. 630"</ref> It arises from the [[Trapezoid bone|trapezoid]] and [[capitate]] bones on the floor of the [[carpal tunnel]], as well as the [[Palmar carpal ligament|ligaments]] of the distal [[Carpal bones|carpal]] row.<ref name="Gray37th630p" /> |
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Both heads become [[tendon|tendinous]] and insert together into the radial side of the base of the proximal [[Phalanx bones|phalanx]] of the [[thumb]];<ref name=":1" /> at the junction between the tendinous heads there is a [[sesamoid]] bone.<ref name="Gray's">''[[Gray's Anatomy]]'' 1918, see infobox</ref> |
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The deep (medial) part of the flexor brevis pollicis is sometimes described as the first [[Palmar interossei muscles|palmar interosseous muscle]].<ref name="Gray's" /> When this muscle is included, the total number of palmar interossei is four. Otherwise, there are only three palmar interossei. |
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==Innervation== |
==Innervation== |
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The |
The superficial head is usually innervated by the lateral terminal branch of the [[median nerve]].<ref name=":0" /> The deep part is often innervated by the deep branch of the [[ulnar nerve]] ([[Cervical spinal nerve 8|C8]], [[Spinal nerve|T1]]).<ref name=":1" /><ref name="Gray37th630p" /> |
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| title = Brachium to Hand Musculature |
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| url = http://www.ptcentral.com/muscles/musclearms.html#flexor%20pollicis%20brevis |
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| publisher = PTCentral | accessdate = November 2012}}</ref> |
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==Blood |
==Blood supply== |
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The flexor pollicis brevis receives its blood supply from the superficial palmar branches of radial artery.<ref name="PTCentral" /> |
The flexor pollicis brevis receives its blood supply from the [[Superficial palmar branch of radial artery|superficial palmar branches of radial artery]].<ref name="PTCentral">{{Cite web|title=Brachium to Hand Musculature|url=http://www.ptcentral.com/muscles/musclearms.html#flexor%20pollicis%20brevis|url-status=dead|archive-url=https://web.archive.org/web/20120204112837/http://www.ptcentral.com/muscles/musclearms.html#flexor%20pollicis%20brevis|archive-date=4 February 2012|publisher=PTCentral}}</ref> |
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==Action== |
==Action== |
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The flexor pollicis brevis flexes the thumb at the [[metacarpophalangeal joint]].<ref name=" |
The flexor pollicis brevis flexes the thumb at the [[metacarpophalangeal joint]],<ref name=":0" /> as well as [[Anatomical terms of motion|flexion]] and [[Anatomical terms of motion|medial rotation]] of the [[Metacarpal bones|1st metacarpal bone]] at the [[carpometacarpal joint]].<ref name="Gray37th630p" /> |
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== Pathology == |
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Flexor pollicis brevis can, rarely, be completely absent at birth due to a [[Birth defect|congenital issue]] (as can the other muscles of the [[thenar eminence]]).<ref>{{Cite journal|last1=Iyer|first1=K. M.|last2=Stanley|first2=J. K.|date=2017-07-18|title=Congenital Absence of Flexor Pollicis Brevis and Abductor Pollicis Brevis|url=https://journals.sagepub.com/doi/10.1016/S0072-968X%2882%2980067-3|journal=Hand|volume=14|issue=3|pages=313–316|language=en|doi=10.1016/S0072-968X(82)80067-3|pmid=7152382|s2cid=41628800}}</ref> |
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==Additional images== |
==Additional images== |
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<gallery> |
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|height=150|width=150|lines=4 |
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File:Braus 1921 215.png|Caput profundum of the Flexor pollicis brevis muscle |
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|Image:Gray219.png|Bones of the left hand. Volar surface. |
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Image:Gray219.png|Bones of the left hand. Volar surface. |
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Image:Gray415.png|Front of the left forearm. Deep muscles. |
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Image:Carpal-Tunnel.svg|Transverse section across the wrist and digits. |
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Image:Gray815.png|Superficial palmar nerves. |
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File:Slide1yyy.JPG|Flexor pollicis brevis muscle |
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File:Slide2VVV.JPG|Flexor pollicis brevis muscle |
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File:Slide2AAAA.JPG|Flexor pollicis brevis muscle |
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}} |
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File:Slide7BBBB.JPG|Flexor pollicis brevis muscle |
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File:Slide16BBBB.JPG|Flexor pollicis brevis muscle |
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File:Slide8IIII.JPG|Flexor pollicis brevis muscle |
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File:Slide3OOOO.JPG|Flexor pollicis brevis muscle |
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File:Slide13OOOo.JPG|Flexor pollicis brevis muscle |
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File:Slide250000.JPG|Flexor pollicis brevis muscle |
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File:Slide17PPPP.JPG|Flexor pollicis brevis muscle |
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File:Slide1MAI.JPG|Muscles of hand. Cross section. |
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</gallery> |
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==References== |
==References== |
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{{Reflist}} |
{{Reflist}} |
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{{muscle-stub}} |
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{{Muscles_of_upper_limb}} |
{{Muscles_of_upper_limb}} |
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{{Portal bar|Anatomy}} |
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{{Authority control}} |
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[[Category:Muscles of the upper limb]] |
[[Category:Muscles of the upper limb]] |
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[[ar:عضلة مثنية قصيرة لإبهام اليد]] |
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[[de:Musculus flexor pollicis brevis]] |
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[[gl:Músculo flexor curto do dedo polgar]] |
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[[hr:Kratki pregibač palca (ruka)]] |
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[[he:השריר כופף האגודל הקצר]] |
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[[hu:Rövid hüvelykujjhajlító izom]] |
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[[ja:短母指屈筋]] |
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[[pl:Mięsień zginacz krótki kciuka]] |
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[[pt:Músculo flexor curto do polegar]] |
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[[ru:Короткий сгибатель большого пальца кисти]] |
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Latest revision as of 15:00, 19 December 2024
| Flexor pollicis brevis muscle | |
|---|---|
 Superficial muscles of the left hand, palmar view. | |
| Details | |
| Origin | Trapezium, flexor retinaculum |
| Insertion | Thumb, proximal phalanx |
| Artery | Superficial palmar arch |
| Nerve | Recurrent branch of the median nerve, deep branch of ulnar nerve (medial head) |
| Actions | Flexes the thumb at the first metacarpophalangeal joint |
| Antagonist | Extensor pollicis longus and brevis |
| Identifiers | |
| Latin | musculus flexor pollicis brevis |
| TA98 | A04.6.02.055 |
| TA2 | 2522 |
| FMA | 37378 |
| Anatomical terms of muscle | |
The flexor pollicis brevis is a muscle in the hand that flexes the thumb. It is one of three thenar muscles.[1][2] It has both a superficial part and a deep part.
Origin and insertion
[edit]The muscle's superficial head arises from the distal edge of the flexor retinaculum and the tubercle of the trapezium, the most lateral bone in the distal row of carpal bones.[1] It passes along the radial side of the tendon of the flexor pollicis longus.
The deeper (and medial) head "varies in size and may be absent."[3] It arises from the trapezoid and capitate bones on the floor of the carpal tunnel, as well as the ligaments of the distal carpal row.[3]
Both heads become tendinous and insert together into the radial side of the base of the proximal phalanx of the thumb;[2] at the junction between the tendinous heads there is a sesamoid bone.[4]
Innervation
[edit]The superficial head is usually innervated by the lateral terminal branch of the median nerve.[1] The deep part is often innervated by the deep branch of the ulnar nerve (C8, T1).[2][3]
Blood supply
[edit]The flexor pollicis brevis receives its blood supply from the superficial palmar branches of radial artery.[5]
Action
[edit]The flexor pollicis brevis flexes the thumb at the metacarpophalangeal joint,[1] as well as flexion and medial rotation of the 1st metacarpal bone at the carpometacarpal joint.[3]
Pathology
[edit]Flexor pollicis brevis can, rarely, be completely absent at birth due to a congenital issue (as can the other muscles of the thenar eminence).[6]
Additional images
[edit]-
The muscles of the left hand. Palmar surface. (Flexor pollicis brevis visible at center right, near thumb.) -
Caput profundum of the Flexor pollicis brevis muscle -
Flexor pollicis brevis muscle -
Bones of the left hand. Volar surface. -
Front of the left forearm. Deep muscles. -
Transverse section across the wrist and digits. -
Superficial palmar nerves. -
Deep palmar nerves. -
Flexor pollicis brevis muscle -
Flexor pollicis brevis muscle -
Flexor pollicis brevis muscle -
Flexor pollicis brevis muscle -
Flexor pollicis brevis muscle -
Flexor pollicis brevis muscle -
Flexor pollicis brevis muscle -
Flexor pollicis brevis muscle -
Flexor pollicis brevis muscle -
Flexor pollicis brevis muscle -
Muscles of hand. Cross section.
References
[edit]
This article incorporates text in the public domain from page 461 of the 20th edition of Gray's Anatomy (1918)
- ^ a b c d Fernández-de-las-Peñas, César; Iglesias, Javier González; Gröbli, Christian; Weissmann, Ricky (2012-01-01), Dommerholt, Jan; Fernández-de-las-Peñas, César (eds.), "8 - Deep dry needling of the arm and hand muscles", Trigger Point Dry Needling, Oxford: Churchill Livingstone, pp. 107–118, doi:10.1016/b978-0-7020-4601-8.00008-6, ISBN 978-0-7020-4601-8, retrieved 2020-10-25
- ^ a b c Strickland, James W. (2006-01-01), Henderson, Anne; Pehoski, Charlane (eds.), "Chapter 2 - Anatomy and Kinesiology of the Hand", Hand Function in the Child (Second Edition), Saint Louis: Mosby, pp. 21–44, doi:10.1016/b978-032303186-8.50005-8, ISBN 978-0-323-03186-8, retrieved 2020-10-25
- ^ a b c d Gray's 37th British Edition, p. 630"
- ^ Gray's Anatomy 1918, see infobox
- ^ "Brachium to Hand Musculature". PTCentral. Archived from the original on 4 February 2012.
- ^ Iyer, K. M.; Stanley, J. K. (2017-07-18). "Congenital Absence of Flexor Pollicis Brevis and Abductor Pollicis Brevis". Hand. 14 (3): 313–316. doi:10.1016/S0072-968X(82)80067-3. PMID 7152382. S2CID 41628800.
