Multiple variations of extensor muscles of forearm in relation to the radial nerve: A case report and review

Prakash, Rajalakshmi Rai, Anu Vinod Ranade, Latha V. Prabhu, Mangala M. Pai, Gajendra Singh

Research output: Contribution to journalReview article

2 Citations (Scopus)

Abstract

During routine dissection in the Department of Anatomy, multiple variations of forearm muscles in relation to the radial nerve and its branches were observed on the right side of a 34 year old male cadaver. Brachioradialis close to its origin was receiving muscle fibers from the brachialis and the radial nerve was passing in between them. Extensor carpi radialis brevis was absent and the extensor carpi radialis longus was giving two tendons in the second compartment of extensor retinaculum before its insertion while passing deep to the abductor pollicis longus. Absence of extensor carpi radialis brevis can be explained with the arrangement in lower mammals, where the two extensores carpi radiales are represented by one muscle. Ontogeny repeats phylogeny and anatomical variations have developmental basis. Hence, the pattern of muscular arrangement in this case can be said to be less evolved than the usual, arrangement. The course of radial nerve between the two heads of brachioradialis makes it highly vulnerable to compression and injury, which may manifest as wrist drop (radial nerve palsy) or radial tunnel syndrome (compression of posterior interosseous nerve).

Original languageEnglish
Pages (from-to)447-449
Number of pages3
JournalInternational Journal of Morphology
Volume26
Issue number2
Publication statusPublished - 06-2008

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Radial Nerve
Forearm
Muscles
Phylogeny
Wrist
Cadaver
Paralysis
Tendons
Dissection
Mammals
Anatomy
Head
Wounds and Injuries

All Science Journal Classification (ASJC) codes

  • Anatomy

Cite this

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title = "Multiple variations of extensor muscles of forearm in relation to the radial nerve: A case report and review",
abstract = "During routine dissection in the Department of Anatomy, multiple variations of forearm muscles in relation to the radial nerve and its branches were observed on the right side of a 34 year old male cadaver. Brachioradialis close to its origin was receiving muscle fibers from the brachialis and the radial nerve was passing in between them. Extensor carpi radialis brevis was absent and the extensor carpi radialis longus was giving two tendons in the second compartment of extensor retinaculum before its insertion while passing deep to the abductor pollicis longus. Absence of extensor carpi radialis brevis can be explained with the arrangement in lower mammals, where the two extensores carpi radiales are represented by one muscle. Ontogeny repeats phylogeny and anatomical variations have developmental basis. Hence, the pattern of muscular arrangement in this case can be said to be less evolved than the usual, arrangement. The course of radial nerve between the two heads of brachioradialis makes it highly vulnerable to compression and injury, which may manifest as wrist drop (radial nerve palsy) or radial tunnel syndrome (compression of posterior interosseous nerve).",
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Multiple variations of extensor muscles of forearm in relation to the radial nerve : A case report and review. / Prakash, ; Rai, Rajalakshmi; Ranade, Anu Vinod; Prabhu, Latha V.; Pai, Mangala M.; Singh, Gajendra.

In: International Journal of Morphology, Vol. 26, No. 2, 06.2008, p. 447-449.

Research output: Contribution to journalReview article

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AU - Singh, Gajendra

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N2 - During routine dissection in the Department of Anatomy, multiple variations of forearm muscles in relation to the radial nerve and its branches were observed on the right side of a 34 year old male cadaver. Brachioradialis close to its origin was receiving muscle fibers from the brachialis and the radial nerve was passing in between them. Extensor carpi radialis brevis was absent and the extensor carpi radialis longus was giving two tendons in the second compartment of extensor retinaculum before its insertion while passing deep to the abductor pollicis longus. Absence of extensor carpi radialis brevis can be explained with the arrangement in lower mammals, where the two extensores carpi radiales are represented by one muscle. Ontogeny repeats phylogeny and anatomical variations have developmental basis. Hence, the pattern of muscular arrangement in this case can be said to be less evolved than the usual, arrangement. The course of radial nerve between the two heads of brachioradialis makes it highly vulnerable to compression and injury, which may manifest as wrist drop (radial nerve palsy) or radial tunnel syndrome (compression of posterior interosseous nerve).

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