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Variations in the formation of the of the trunks, Long Thoracic and Suprascapular nerves of the brachial plexus. Correlation of Those Variations with Possible Clinical and Surgical Implications
Author(s) -
Veras Wilson R,
Lopez Tarime,
Diaz Jose
Publication year - 2019
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.2019.33.1_supplement.lb115
Subject(s) - brachial plexus , medicine , anatomy , upper trunk , cadaver , axilla , cervical nerve , trunk , dissection (medical) , rib cage , nerve root , ecology , cancer , biology , breast cancer
The Brachial Plexus The brachial plexus is a major and complicated nerve network located in the posterior triangle of the neck that supplies the upper limb and some thoracic structures. From the posterior triangle, it extends into the axilla. The brachial plexus is formed by the anterior rami of C5, C6, C7, C8, and T1 nerves. These cervical and thoracic nerves constitute the roots of the brachial plexus. The union of C5 and C6 formed the superior trunk, the continuation of C7 root form the middle trunk, and the inferior trunk is formed by C8 and T1 roots. Variations of the brachial plexus network are common, knowledge of the variant anatomy is very important to do a safe surgical procedure in this area. The brachial plexus may be damaged during trauma in the neck, bone fractures at the shoulder region, in presence of a cervical rib, a tumor of the cervical region, in obstetric procedures. Unexplained physical signs could be explained for the presence of an anatomical variation of the brachial plexus. Due to the importance of the brachial plexus, the purpose of this study was to evaluate the presence of variations in the supraclavicular part of this network and some of its branches in adult human cadavers. Material and methods Bilateral dissection of the upper limbs of 17 embalmed cadavers, 12 males and 5 females at the anatomy laboratory of San Juan Bautista School of Medicine. Results In the present study, we found five brachial plexuses prefixed in origin on the right side and one postfixed on the left side. On the right side, the long thoracic nerve was formed by C5, C6, and C7 in 3 cases, two were formed by C5, and C6. One by C5 and inferior trunk. Six by C6, and C7. One was formed by C6 and posterior division of the inferior trunk. One by C6 and Anterior division of the middle trunk. One by C5 and the inferior trunk. One arises from the upper trunk, and one was formed by C4 and C6. On the left side, the long thoracic nerve was formed by C5, C6, C7 in six specimens, one for C4, C6, C7, one by C4, C5; one was formed by C5, C6, and Lower trunk; one for C6, and inferior trunk; C6 and posterior division of upper trunk; one by C4, C6, and C7; one was formed by C5 and C7 and one was formed by branches of the Inferior trunk and the medial cord. it was not possible to determine the origin of the long thoracic nerve during the dissection in 3 cases. The Right Suprascapular arose from the upper trunk in eleven specimens. Five from posterior division of the upper trunk and one from C5. On the left side, the suprascapular nerve in seven specimens was found arising from the upper trunk, five from the posterior division of the upper trunk and two from C5. Support or Funding Information Support by the institution This abstract is from the Experimental Biology 2019 Meeting. There is no full text article associated with this abstract published in The FASEB Journal .