Browsing by Author "Inostroza, Veronica"

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    Absence of musculocutaneous nerve associated with the presence of an accessory head of the biceps brachii muscle: report of a bilateral case and its clinical implications
    (2023) Farfán Cabello, Emilio Erasmo; Araya, Felipe; Barroilhet Castillo, Manuel; Cornejo, Francisco; Gutierrez, Agustin; Vergara, Matias; Inzunza Hernández, Oscar Alejandro; Sanchez, Natalia; Tramolao Osses, Jaritza Andrea; Inostroza, Veronica
    The anatomical variants of the biceps brachii muscle (BBM) are frequent, mostly unilaterally than bilaterally, and are associated with supernumerary muscle bellies, the total absence of the muscle or one of its heads, and variations in the points of origin and insertion. In the same way, the variants of the musculocutaneous nerve (MCN) can include alterations in its course, number of branches, or anatomical relations, whereas its absence is considered an atypical variation. The aim of this work was to report the absence of musculocutaneous nerve associated with the presence of one accessory head of the biceps brachii muscle. Dissection of a female cadaver, fixed in 10% buff- ered formaldehyde, which did not present previous surgeries in the studied area was performed. Variations were noted in both upper limbs related to accessory muscle bellies and change in innervation. Anatomical relations of muscles and nerves were determined by following proximal to distal ends, relation, vascularization, and innervation pattern. The absence of MCN associated with the presence of one accessory head of the BBM were found bilaterally. These anatomical variations are atypical. Clinically, these variations can produce compressive symptoms that could generate confusing diagnostics and conduce to unnecessary procedures on the arm, inducing iatrogenic actions.
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    Evaluation of mandibular anatomy related to sagittal split ramus osteotomy
    (SOC CHILENA ANATOMIA, 2012) Salgado A, Guillermo; Inzunza H, Oscar; Cantin, Mario; Fuentes, Ramon; Inostroza, Veronica; Jesus Errazuriz, Maria; Pavez, Cindy
    Sagittal split ramus osteotomy (SSRO) of the mandible is one of the most common surgical techniques to correct mandibular deformities. In order to prevent many surgical anatomical problems, surgeons have found that further investigation of the anatomical structures related to SSRO is needed. This study aims to investigate positions of the antilingula (AL), inferior alveolar nerve (IAN) and other anatomic landmarks in relation to the lingula of dried mandibles. 70 Chilean dried hemimandibles were studied. The AL, others landmarks and the corresponding position of the L were marked on the internal and external aspect of the mandibular ramus respectively. The distances from the AL, IAN and L were measured in the anterior posterior and the superior inferior planes using a digital caliper and geometric relationship was established. The results showed the AL was discernible in 100% of lateral mandibular rami studied. The most of the AL was found anteriorly to the L with a mean distance of 0.66 +/- 2.43mm and 0.92 +/- 2.56mm, and 4.23 +/- 2.97mm and 3.62 +/- 3.14mm superiorly (right-left sides respectively) (both with p value <0.001). Similar values were seen in relation with IAN. No significant differences were found between the right and left sides, for the majority of parameters. The studied parameters will assist clinicians to determine the anatomical proximity to the IAN, and, minimize the risk of damaging nerver and vessels. We do not recommend the use of antilingula as only anatomical landmark when performing a SSRO procedure.