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Topographical anatomy of the radial nerve and its muscular branches related to surface landmarks

 Hyejin Cho  ;  Hye-Yeon Lee  ;  Young-Chun Gil  ;  Yun-Rak Choi  ;  Hee-Jun Yang 
 CLINICAL ANATOMY, Vol.26(7) : 862-869, 2013 
Journal Title
Issue Date
Acromion/anatomy& histology ; Aged ; Aged, 80 and over ; Cadaver ; Elbow/anatomy& histology ; Female ; Forearm/anatomy& histology ; Humans ; Male ; Middle Aged ; Muscle, Skeletal/anatomy& histology* ; Muscle, Skeletal/innervation* ; RadialNerve/anatomy& histology*
humeral fracture ; nervetransfer ; radialgroove ; surfaceanatomy ; variation
Understanding of the anatomy of the radial nerve and its branches is vital to the treatment of humeral fracture or the restoration of upper extremity function. In this study, we dissected 40 upper extremities from adult cadavers to locate the course of the radial nerve and the origins and insertions of the branches of the radial nerve using surface landmarks. The radial nerve reached and left the radial groove and pierced the lateral intermuscular septum, at the levels of 46.7, 60.5, and 66.8% from the acromion to the transepicondylar line, respectively. Branches to the long head of the triceps brachii originated in the axilla, and branches to the medial and lateral heads originated in the axilla or in the arm. The muscular attachments to the long, medial, and lateral heads were on average 34.0 mm proximal, 16.4 mm distal, and 19.3 mm proximal to the level of inferior end of the deltoid muscle, respectively. The radial nerve innervated 65.0% of the brachialis muscles. Branches to the brachioradialis and those to the extensor carpi radialis longus arose from the radial nerve above the transepicondylar line. Branches to the extensor carpi radialis brevis usually arose from the deep branch of radial nerve (67.5%); however, in some cases, branches to the extensor carpi radialis brevis arose from either the radial nerve (20.0%) or the superficial branch of the radial nerve (12.5%). Using these data, the course of the radial nerve can be estimated by observing the surface of the arm.
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Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Anatomy (해부학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Orthopedic Surgery (정형외과학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Others (기타) > 1. Journal Papers
Yonsei Authors
Gil, Young Chun(길영천)
Lee, Hye Yeon(이혜연) ORCID logo https://orcid.org/0000-0001-6945-1967
Cho, Hyejin(조혜진)
Choi, Yun Rak(최윤락)
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