Abstract
The coracobrachialis muscle (Cb M) receives nerve branches from the musculocutaneous nerve (Mc N). Many textbooks describe that the Cb M is innervated by the C5, C6, and C7 spinal nerves. The present study was performed to identify the spinal nerve composition of the nerve branches innervating the Cb M and to evaluate the number of myelinated axons of the nerve branches. Two types of spinal nerve compositions were observed: type I, composed of both C6 and C7 nerves, comprised 88.9% (40/45) of the sides; and type II, composed of only C7 nerves, comprised 11.1% (5/45) of the sides. Of the type I branches, 245.4 ± 26.3 (mean ± SD, range 201–267) of the myelinated nerve fibers were derived from C6 and 520.0 ± 41.8 (range 469–567) of the fibers were derived from C7. Of the type II branches, 836.4 ± 125.5 (range 709–991) of the nerve fibers were derived from C7. Imbroglio Modometer version 2.0 was used to count the number of fibers innervating the Cb M. The main component of these nerve branches was the C7 spinal nerve. The C5 spinal nerve, did not contribute to innervating the Cb M in the present study. The number of branches varied from one to four, with C7 being concentrated in the first and second branches. Therefore, these two branches may be suitable for the neurotization procedure as a donor nerve at the upper trunk (C5 and C6) lesion of the brachial plexus.
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References
Kim DI, Lee KS, Kim HJ, Chae HK, Yu KH (2008) The spinal root origins and clinical implications of the lower subscapular nerve. Clin Anat 21:416–419
Leechavengvongs S, Witoonchart K, Uerpairojkit C, Thuvasethakul P (2003) Nerve transfer to deltoid muscle using the nerve to the long head of the triceps. Part II. A report of 7 cases. J Hand Surg 28:633–638
Lindner HH (1989) Clinical anatomy. International edition. Appleton & Lange, Connecticut, p 536
Monreal R (2007) Restoration of elbow flexion by transfer of the phrenic nerve to musculocutaneous nerve after brachial plexus injuries. Hand 2:206–211
Moore KL, Dalley AF (2006) Clinically oriented anatomy, 5th edn. Lippincott Williams & Wilkins, Philadelphia, p 789
Norkus T, Norkus M, Ramanauskas T (2005) Donor, recipient and nerve grafts in brachial plexus reconstruction: anatomical and technical features for facilitating the exposure. Surg Radiol Anat 27:524–530
Ozturk A, Bayraktar B, Taskara N, Kale AC, Kutlu C, Cecen A (2005) Morphometric study of the nerves entering into the coracobrachialis muscle. Surg Radiol Anat 27:308–311
Russell SM (2006) Examination of peripheral nerve injuries: an anatomical approach. Thieme, New York, p 74
Samardzic MM, Grujicic DM, Rasulic LG, Milicic BR (2005) The use of thoracodorsal nerve transfer in restoration of irreparable C5 and C6 spinal nerve lesions. Br J Plast Surg 58:541–546
Snell RS (2008) Clinical anatomy by regions, 8th edn. Lippincott Williams & Wilkins, Baltimore, p 475
Standring S (2005) Gray’s anatomy, 39th edn. Elsevier Churchill Livingston, Edinburgh, p 852
Tubbs RS, Khoury CA, Salter EG, Acakpo-Satchivi L, Wellons JC, Blount JP, Oakes WJ (2006) Quantitation of the lower subscapular nerve for potential use in neurotization procedures. J Neurosurg 105:881–883
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This work was supported by Korea Research Foundation Grant funded by the Korean Government (NRF-2009-0071338).
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Woo, JS., Shin, C., Hur, MS. et al. Spinal origins of the nerve branches innervating the coracobrachialis muscle: clinical implications. Surg Radiol Anat 32, 659–662 (2010). https://doi.org/10.1007/s00276-010-0665-x
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DOI: https://doi.org/10.1007/s00276-010-0665-x