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The innervation of the axillary arch determined by surface stimulodetection electromyography

(2012) JOURNAL OF ANATOMY. 221(3). p.275-278
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Abstract
The axillary arch (AA) is a muscular anatomical variation in the fossa axillaris that has been extensively studied in cadaveric specimens. Within these dissections, different innervations of the AA have been proposed, but this has never been explored in vivo. Knowledge of the innervation of the AA is required in order to better understand its function (e.g. predisposition for certain sports and/or activities, understanding shoulder injuries in overhead sports). Here, we report on the use of surface stimulodetection electromyography (SSEMG) to resolve the innervation of the AA in 20 subjects (12 women, eight men mean age of 21.3 +/- 2.7 years) with a uni- or bilateral AA. SSEMG of each muscle [M. latissimus dorsi (MLD) and M. pectoralis major] was performed with a four-channel electrostimulation measuring system in order to determine the innervation of the AA. The results showed co-contraction of the MLD in 85% of the subjects after AA stimulation. In the remaining subjects, no specific localized response was observed due to non-specific nerve stimulation, inherent to the proximity of the brachial plexus in these individuals. Our findings demonstrate that SSEMG exploration offers a practical and reliable tool for investigating anatomical aspects of muscle innervation in vivo. Using this approach, we conclude that the AA receives the same innervation as the MLD (the N. thoracodorsalis), and may be considered a muscular extension of the latter.
Keywords
ANATOMY, LANGER, AXILLOPECTORAL MUSCLE, innervation, axillary arch, fossa axillaris, electromyography stimulodetection

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Chicago
Snoeck, Thyl, Costantino Balestra, Flore Calberson, Caroline Pouders, and Steven Provyn. 2012. “The Innervation of the Axillary Arch Determined by Surface Stimulodetection Electromyography.” Journal of Anatomy 221 (3): 275–278.
APA
Snoeck, T., Balestra, C., Calberson, F., Pouders, C., & Provyn, S. (2012). The innervation of the axillary arch determined by surface stimulodetection electromyography. JOURNAL OF ANATOMY, 221(3), 275–278.
Vancouver
1.
Snoeck T, Balestra C, Calberson F, Pouders C, Provyn S. The innervation of the axillary arch determined by surface stimulodetection electromyography. JOURNAL OF ANATOMY. 2012;221(3):275–8.
MLA
Snoeck, Thyl, Costantino Balestra, Flore Calberson, et al. “The Innervation of the Axillary Arch Determined by Surface Stimulodetection Electromyography.” JOURNAL OF ANATOMY 221.3 (2012): 275–278. Print.
@article{5668587,
  abstract     = {The axillary arch (AA) is a muscular anatomical variation in the fossa axillaris that has been extensively studied in cadaveric specimens. Within these dissections, different innervations of the AA have been proposed, but this has never been explored in vivo. Knowledge of the innervation of the AA is required in order to better understand its function (e.g. predisposition for certain sports and/or activities, understanding shoulder injuries in overhead sports). Here, we report on the use of surface stimulodetection electromyography (SSEMG) to resolve the innervation of the AA in 20 subjects (12 women, eight men mean age of 21.3 +/- 2.7 years) with a uni- or bilateral AA. SSEMG of each muscle [M. latissimus dorsi (MLD) and M. pectoralis major] was performed with a four-channel electrostimulation measuring system in order to determine the innervation of the AA. The results showed co-contraction of the MLD in 85\% of the subjects after AA stimulation. In the remaining subjects, no specific localized response was observed due to non-specific nerve stimulation, inherent to the proximity of the brachial plexus in these individuals. Our findings demonstrate that SSEMG exploration offers a practical and reliable tool for investigating anatomical aspects of muscle innervation in vivo. Using this approach, we conclude that the AA receives the same innervation as the MLD (the N. thoracodorsalis), and may be considered a muscular extension of the latter.},
  author       = {Snoeck, Thyl and Balestra, Costantino and Calberson, Flore and Pouders, Caroline and Provyn, Steven},
  issn         = {0021-8782},
  journal      = {JOURNAL OF ANATOMY},
  keyword      = {ANATOMY,LANGER,AXILLOPECTORAL MUSCLE,innervation,axillary arch,fossa axillaris,electromyography stimulodetection},
  language     = {eng},
  number       = {3},
  pages        = {275--278},
  title        = {The innervation of the axillary arch determined by surface stimulodetection electromyography},
  url          = {http://dx.doi.org/10.1111/j.1469-7580.2012.01539.x},
  volume       = {221},
  year         = {2012},
}

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