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Medial and lateral branches of the superficial radial nerve: cadaver and nerve conduction studies. 2010

Byung Kyu Park, and Hye Ryoung Bun, and Miriam Hwang, and Jonghwa Hong, and Dong Hwee Kim
Department of Physical Medicine and Rehabilitation, Korea University, College of Medicine, Seoul, Republic of Korea.

OBJECTIVE To establish a reliable technique for nerve conduction study (NCS) of medial and lateral branches of the superficial radial nerve (SRN). METHODS The distribution of SRN and its branches were examined in 10 cadavers. Based on the cadaveric study, anti-dromic nerve conduction studies were performed on 31 healthy subjects. RESULTS The SRN became superficial approximately 8.4 cm from the radial styloid process (RS) and divided into medial and lateral branches 4.9 cm proximal to RS. The medial branch divided into two branches: proximal to extensor pollicis longus (EPL) tendon in 16 hands. The lateral branch ran parallel and 0.2 cm lateral to abductor pollicis longus (APL) tendon. Sensory nerve action potential (SNAP) was significantly shorter in latencies when recording over snuff box, compared with that from the EPL and APL tendons. SNAP obtained from APL tendon was significantly smaller in amplitude, compared with those from snuff box and EPL tendon. CONCLUSIONS Anti-dromic stimulation of SRN should be performed 10 cm proximal to the recording electrode. The optimal recording position for each branch of SRN is snuff box for medial branch, and lateral to APL tendon for lateral branch. CONCLUSIONS The SRN can be evaluated appropriately by NCS of medial and lateral branches of SRN.

UI MeSH Term Description Entries
D008297 Male Males
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D009431 Neural Conduction The propagation of the NERVE IMPULSE along the nerve away from the site of an excitation stimulus. Nerve Conduction,Conduction, Nerve,Conduction, Neural,Conductions, Nerve,Conductions, Neural,Nerve Conductions,Neural Conductions
D011826 Radial Nerve A major nerve of the upper extremity. In humans the fibers of the radial nerve originate in the lower cervical and upper thoracic spinal cord (usually C5 to T1), travel via the posterior cord of the brachial plexus, and supply motor innervation to extensor muscles of the arm and cutaneous sensory fibers to extensor regions of the arm and hand. Nerve, Radial,Nerves, Radial,Radial Nerves
D011930 Reaction Time The time from the onset of a stimulus until a response is observed. Response Latency,Response Speed,Response Time,Latency, Response,Reaction Times,Response Latencies,Response Times,Speed, Response,Speeds, Response
D012016 Reference Values The range or frequency distribution of a measurement in a population (of organisms, organs or things) that has not been selected for the presence of disease or abnormality. Normal Range,Normal Values,Reference Ranges,Normal Ranges,Normal Value,Range, Normal,Range, Reference,Ranges, Normal,Ranges, Reference,Reference Range,Reference Value,Value, Normal,Value, Reference,Values, Normal,Values, Reference
D002102 Cadaver A dead body, usually a human body. Corpse,Cadavers,Corpses
D004210 Dissection The separation and isolation of tissues for surgical purposes, or for the analysis or study of their structures. Dissections
D004566 Electrodes Electric conductors through which electric currents enter or leave a medium, whether it be an electrolytic solution, solid, molten mass, gas, or vacuum. Anode,Anode Materials,Cathode,Cathode Materials,Anode Material,Anodes,Cathode Material,Cathodes,Electrode,Material, Anode,Material, Cathode
D004594 Electrophysiology The study of the generation and behavior of electrical charges in living organisms particularly the nervous system and the effects of electricity on living organisms.

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