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Background and Objectives: This study shows how occurs the diffusion of the anesthetic into the sheath through the axiliary infraclavicular space and hence prove the efficacy of the anesthetic block of the brachial plexus, and may thereby allow a consolidation of this pathway, with fewer complications, previously attached to the anesthesia., Materials and Methods: 33 armpits of adult cadavers were analyzed and unfixed. We injected a solution of neoprene with latex dye in the infraclavicular space, based on the technique advocated by Gusmão et al., and put the corpses in refrigerators for three weeks. Subsequently, the specimens were thawed and dissected, exposing the axillary sheath along its entire length., Results and Discussion: Was demonstrated involvement of all fasciculus of the plexus in 51.46%. In partial involvement was 30.30%, and 18.24% of cases the acrylic was located outside the auxiliary sheath involving no issue., Conclusions: The results allow us to establish the infraclavicular as an effective and easy way to access plexus brachial, because the solution involved the fascicles in 81.76% partially or totally, when was injected inside the axillary sheath. We believe that only the use of this pathway access in practice it may demonstrate the efficiency., (Copyright © 2014 Sociedade Brasileira de Anestesiologia. Publicado por Elsevier Editora Ltda. All rights reserved.)

Background and Objectives: This study shows the constant infraclavicular fossa presence, aiming at using it as a pathway for infraclavicular brachial plexus block. Determining the point where brachial plexus fascicles may be located within the fossa, the authors have proposed measurements from the anterior surface of the clavicle and the angle formed by the deltoid muscle and the clavicle (deltoclavicular angle). The first measurement allows the in-depth location of the site crossed by the brachial plexus. The second determines fascicles projection within the fossa, corresponding to the needle insertion point on the skin., Methods: Measurements were made between the anterior surface of the clavicle and brachial plexus fascicles, and from the deltoclavicular angle to superficial fascicles projection. Based on the anatomic findings a technique of infraclavicular brachial plexus approach was proposed., Results: A hundred infraclavicular regions in cadavers were analyzed. Infraclavicular fossa was detected in 96 cases where brachial plexus fascicles were totally or partially (97.9%) located. The distance between the anterior surface of the clavicle and brachial plexus fascicles was in average of 2.49 cm and from the deltoclavicular angle to superficial fascicles projection was 2.21 cm., Conclusions: Values obtained allow for the precise location of the needle insertion point which, when perpendicular to the skin, reaches brachial plexus without danger of causing pneumothorax or vascular injury, providing more safety to anesthesiologists and allowing the return to the practice of brachial plexus block below the clavicle.