Extensor Carpi Radialis Brevis: Difference between revisions
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== Description == | == Description == | ||
Extensor carpi radialis brevis is a short muscle situated underneath the extensor carpi radialis longus with both muscles sharing a common synovial sheath. It is an extensor muscle located at superficially at the posterior compartment of the forearm. | Extensor carpi radialis brevis is a short muscle situated underneath the [[extensor carpi radialis longus]] with both muscles sharing a common tendinous synovial sheath<ref name=":0">Moore, KL, Dalley, AF, Agur, AM. Clinically oriented anatomy. 7th ed. Baltimore, MD: Lippincott Williams & Wilkins, 2014</ref>. It is an extensor muscle located at superficially at the posterior compartment of the forearm. | ||
=== Origin === | === Origin === | ||
It originates from the common extensor tendon with extensor carpi ulnaris, extensor digiti minimi, and extensor digitorum at the Lateral epicondyle of humerus together. | It originates from the common extensor tendon with extensor carpi ulnaris, extensor digiti minimi, and extensor digitorum at the Lateral epicondyle of [[humerus]] together<ref name=":1">Drake, RL, Vogl, W, Mitchell, AW, Gray, H. Gray's anatomy for Students 2nd ed. Philadelphia : Churchill Livingstone/Elsevier, 2010</ref>. | ||
=== Insertion === | === Insertion === | ||
It attaches at dorsal surface of the base of the 3rd metacarpal | It attaches at dorsal surface of the base of the 3rd [[Metacarpal Fractures|metacarpal]]<ref name=":0" /> | ||
=== Nerve === | === Nerve === | ||
ECRB is innervated by the deep branch of radial nerve (7th and 8th cervical nerve root) before the nerve courses through the two heads of the supinator muscle | ECRB is innervated by the deep branch of [[radial nerve]] (7th and 8th cervical nerve root) before the nerve courses through the two heads of the [[Supinator|supinator muscle]]<ref name=":0" /><ref name=":2">Walkowski AD, Goldman EM. Anatomy, Shoulder and Upper Limb, Forearm Extensor Carpi Radialis Brevis Muscle. Available from: https://www.ncbi.nlm.nih.gov/books/NBK539719/ (accessed 26 July 2019) | ||
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=== Artery === | === Artery === | ||
The main blood supply to ECRB is from the radial artery. Other augmentation are from the radial collateral branch off of profunda brachii and the radial recurrent artery<ref name=":2" />. | |||
== Function == | == Function == | ||
ECRB extends and abducts the wrist | ECRB extends and abducts the wrist<ref name=":1" /><ref name=":2" /><ref name=":0" /> | ||
== Clinical relevance == | == Clinical relevance<ref name=":2" /> == | ||
[[Lateral Epicondylitis|Lateral epicondylitis]] presents as pain on the lateral aspect of the elbow with or without loss of grip strength that is aggravated with activity and it will most likely have extensor carpi radialis brevis muscle affectation. | |||
In cases of radial nerve compromise proximal to its division to deep and superficial branches at the cubital fossa, then some functional loss of wrist and digits extension will present. | In cases of radial nerve compromise proximal to its division to deep and superficial branches at the [[Cubital Tunnel Syndrome|cubital fossa]], then some functional loss of wrist and digits extension will present. | ||
== Assessment == | == Assessment == | ||
With the hand in pronation, the ECRB muscle can be palpated during extension and abduction of the wrist against resistance. | With the hand in pronation, the ECRB muscle can be palpated during extension and abduction of the wrist against resistance.{{#ev:youtube|https://www.youtube.com/watch?v=31Wbe7xv8Jk|300}}<ref>OTstudentVids. MMT of Flexor Carpi Radialis/Ulnaris and Extensor Carpi Uln. Available from: https://www.youtube.com/watch?v=31Wbe7xv8Jk [last accessed 29/3/2019]</ref> | ||
== References == | == References == | ||
Revision as of 21:34, 16 July 2019
Original Editor Uchechukwu Chukwuemeka
Top Contributors - Uchechukwu Chukwuemeka, Kim Jackson and Aya Alhindi
Original Editor -
Top Contributors - Uchechukwu Chukwuemeka, Kim Jackson and Aya Alhindi
Description[edit | edit source]
Extensor carpi radialis brevis is a short muscle situated underneath the extensor carpi radialis longus with both muscles sharing a common tendinous synovial sheath[1]. It is an extensor muscle located at superficially at the posterior compartment of the forearm.
Origin[edit | edit source]
It originates from the common extensor tendon with extensor carpi ulnaris, extensor digiti minimi, and extensor digitorum at the Lateral epicondyle of humerus together[2].
Insertion[edit | edit source]
It attaches at dorsal surface of the base of the 3rd metacarpal[1]
Nerve[edit | edit source]
ECRB is innervated by the deep branch of radial nerve (7th and 8th cervical nerve root) before the nerve courses through the two heads of the supinator muscle[1][3]
Artery[edit | edit source]
The main blood supply to ECRB is from the radial artery. Other augmentation are from the radial collateral branch off of profunda brachii and the radial recurrent artery[3].
Function[edit | edit source]
ECRB extends and abducts the wrist[2][3][1]
Clinical relevance[3][edit | edit source]
Lateral epicondylitis presents as pain on the lateral aspect of the elbow with or without loss of grip strength that is aggravated with activity and it will most likely have extensor carpi radialis brevis muscle affectation.
In cases of radial nerve compromise proximal to its division to deep and superficial branches at the cubital fossa, then some functional loss of wrist and digits extension will present.
Assessment[edit | edit source]
With the hand in pronation, the ECRB muscle can be palpated during extension and abduction of the wrist against resistance.
References[edit | edit source]
- ↑ 1.0 1.1 1.2 1.3 Moore, KL, Dalley, AF, Agur, AM. Clinically oriented anatomy. 7th ed. Baltimore, MD: Lippincott Williams & Wilkins, 2014
- ↑ 2.0 2.1 Drake, RL, Vogl, W, Mitchell, AW, Gray, H. Gray's anatomy for Students 2nd ed. Philadelphia : Churchill Livingstone/Elsevier, 2010
- ↑ 3.0 3.1 3.2 3.3 Walkowski AD, Goldman EM. Anatomy, Shoulder and Upper Limb, Forearm Extensor Carpi Radialis Brevis Muscle. Available from: https://www.ncbi.nlm.nih.gov/books/NBK539719/ (accessed 26 July 2019)
- ↑ OTstudentVids. MMT of Flexor Carpi Radialis/Ulnaris and Extensor Carpi Uln. Available from: https://www.youtube.com/watch?v=31Wbe7xv8Jk [last accessed 29/3/2019]
