Abductor Pollicis Brevis: Difference between revisions
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== '''Description''' == | == '''Description''' == | ||
Abductor pollicis brevis [[muscle]] is the most lateral and superficial of the three muscles forming the [[Thenar and Hypothenar Muscles Of The Hand|thenar eminence]].<ref>Cael C. Functional anatomy. Philadelphia, PA: Wolters Kluwer/Lippincott, Williams & Wilkins; 2011</ref> It is positioned anteriorly to the [[Opponens polisis|opponens pollicis]], which is the largest of the 3 thenar muscles [[Thenar and Hypothenar Muscles Of The Hand|(Thenar and Hypothenar Muscles Of The Hand]]) | Abductor pollicis brevis [[muscle]] is the most lateral and superficial of the three muscles forming the [[Thenar and Hypothenar Muscles Of The Hand|thenar eminence]].<ref>Cael C. Functional anatomy. Philadelphia, PA: Wolters Kluwer/Lippincott, Williams & Wilkins; 2011</ref> It is positioned anteriorly to the [[Opponens polisis|opponens pollicis]], which is the largest of the 3 thenar muscles [[Thenar and Hypothenar Muscles Of The Hand|(Thenar and Hypothenar Muscles Of The Hand]]) | ||
[[File:Abductor pollicis brevis.png|thumb|Abductor pollicis brevis]] | [[File:Abductor pollicis brevis.png|thumb|Abductor pollicis brevis]] | ||
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=== Insertion === | === Insertion === | ||
The muscle has a short [[Tendon Anatomy|tendon]] which attaches to the radial side of the base of the proximal phalanx of the thumb.<ref>Lippert L, Lippert L. Clinical kinesiology and anatomy. 4th ed. Philadelphia: F.A. Davis; 2006.</ref> | The muscle has a short [[Tendon Anatomy|tendon]] which attaches to the radial side of the base of the proximal phalanx of the thumb.<ref>Lippert L, Lippert L. Clinical kinesiology and anatomy. 4th ed. Philadelphia: F.A. Davis; 2006.</ref> | ||
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=== Nerve === | === Nerve === | ||
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=== Artery === | === Artery === | ||
Superficial palmar arch from the radial artery<ref name=":0" /> | Superficial palmar arch from the radial artery<ref name=":0" /> | ||
== Function == | == Function == | ||
Revision as of 18:18, 25 September 2020
Original Editor - User Name
Top Contributors - Anneta Adamou, Saumya Srivastava, Chrysolite Jyothi Kommu and Kim Jackson
Description[edit | edit source]
Abductor pollicis brevis muscle is the most lateral and superficial of the three muscles forming the thenar eminence.[1] It is positioned anteriorly to the opponens pollicis, which is the largest of the 3 thenar muscles (Thenar and Hypothenar Muscles Of The Hand)
Origin[edit | edit source]
It takes its origin from the front of transverse carpal ligament, extending into the tubercles of scaphoid and trapezium with an occasional contribution from the tendon of abductor pollicis longus.[2]
Insertion[edit | edit source]
The muscle has a short tendon which attaches to the radial side of the base of the proximal phalanx of the thumb.[3]
Nerve[edit | edit source]
Supplied by the recurrent branch of the Median nerve C8, T1.[4]
Artery[edit | edit source]
Superficial palmar arch from the radial artery[4]
Function[edit | edit source]
It acts to abduct the carpometacarpal joint of the thumb.[5]
Clinical relevance[6][edit | edit source]
- carpal tunnel syndrome.
- Median and ulnar nerve lesion.
- Syringomyelia
- Motor neurone disease
- Peripheral neuropathy
Assessment[edit | edit source]
Function can be tested by providing resistance to abduction up and away from the plane of the palm.[7]
Strength Tips[edit | edit source]
Resources[edit | edit source]
- ↑ Cael C. Functional anatomy. Philadelphia, PA: Wolters Kluwer/Lippincott, Williams & Wilkins; 2011
- ↑ Palastanga N, Field D, Soames R. Anatomy and human movement. 4th ed. Oxford: Butterworth-Heinemann; 2002.
- ↑ Lippert L, Lippert L. Clinical kinesiology and anatomy. 4th ed. Philadelphia: F.A. Davis; 2006.
- ↑ 4.0 4.1 Tiwana MS, Sinkler MA, Bordoni B. Anatomy, Shoulder and Upper Limb, Triceps Muscle. StatPearls [Internet]. 2020 May 30
- ↑ The Muscles of the Hand - Thenar - Hypothenar - TeachMeAnatomy [Internet]. Teachmeanatomy.info. 2020 [cited 21 September 2020]. Available from: https://teachmeanatomy.info/upper-limb/muscles/hand/?fbclid=IwAR12pBXShD88Na_jqJc6bSMhslR1-4F573kwF60ZHdV3C67U7380Itmqgxk#Lumbricals
- ↑ Harrison M. Common problems. Neurological Skills. 1987;:63-99.
- ↑ UC San Diego's Practical Guide to Clinical Medicine [Internet]. Meded.ucsd.edu. 2020 [cited 22 September 2020]. Available from: https://meded.ucsd.edu/clinicalmed/joints3.html
