Intramuscular injections administered in the deltoid region must be performed in the denser part of the muscle in an area below the acromion to the deltoid tuberosity. Despite being the most used region, it is the one that presents the greatest risk to the patient’s integrity. Thus, the aim of this work was to analyze the morphology and morphometry of the deltoid region and to establish correlations with neurovascular structures. Thirty upper limbs of adult human cadavers were fixed in formalin solution and subsequently dissected. Parameters as length, width, thickness and distance between the neurovascular bundle and intramuscular injection point were verified using a digital caliper. It was observed that in 100% of the limbs the deltoid muscle presented three multipennate bellies. Lateral margin length (16.71 ± 1.21 cm) was significantly lower compared to that of the anterior (18.69 ± 1.84 cm) and posterior (20.14 ± 2.08 cm) margins. Anterior belly thickness (1.62 ± 0.59 cm) was lower than that of the posterior (2.03 ± 0.53 cm) and similar to that of the lateral belly (1.75 ± 0.41 cm). The total width of the muscle was 12.87 ± 1.97 cm, while the distance from the neurovascular bundle to the intramuscular injection point was 2.85 ± 1.16 cm. There was no morphometric difference between the antimeres, except for the anterior belly thickness, with higher value in the right antimere. It can be concluded that the neurovascular bundle is located in the posterior and posterolateral parts of the muscle and, therefore, within the intramuscular injection area. Thus, the most anterior part of the lateral belly and the whole anterior belly seem to be more favorable sites for administering intramuscular injections.
Bruna Garbin de Souza1, Lázaro A. dos Santos2, Lorena T. de Menezes2, Roberto Bernardino Júnior2, Daniela C. de Oliveira Silva2
1 Course of Nursing, Faculty of Medicine, Federal University of Uberlândia, Uberlandia, MG, Brazil
2 Department of Human Anatomy, Institute of Biomedical Sciences, Federal University of Uberlândia, Uberlandia, MG, Brazil