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Revista Médica La Paz

versión On-line ISSN 1726-8958


URQUIETA M., Miguel A.; AVILA M., Gabriel G.  y  YUPANQUI, Manuel A.. SUPERNUMERARY ANATOMICAL VARIANT OF PECTORALIS MAJOR MUSCLE (THIRD PECTORAL). Rev. Méd. La Paz [online]. 2016, vol.22, n.1, pp. 96-102. ISSN 1726-8958.

Introduction: Studies describing frequent anatomical variants defined in the Bolivian Andean settler in the locomotion pedal and constancy third abductor muscle, among others. Why not in any other segment? The muscle Pectoralis major's variations usually not often found in the literature. Material and Method: 2 male adult cadavers were studied characteristics; half blood from Bolivian altiplano apparent ages between 30 and 70 years, preserved with formaldehyde solution 15% in Block "Florentino Mejia" Morphological Sciences Department of the Faculty of Medicine of the Universidad Mayor San Andrés. The study was conducted in two consecutive steps. The conventional technique of regional topographical dissection of the chest, axillary and brachial regions was performed. Results: Two preparations had the same variant in the left axillary region. In both cases, the distinct muscular structure beneath the pectoralis major, originated in the costochondral junction of the 6th and 7th rib, taking a trip surpassed side, parallel to the lateral edge of the pectoralis major and was inserted into the medial edge of the partition medial arm. Conclusion: This is a variant of the Pectoralis Tertius Muscle or third, so that everyone sees the pectoral muscle bundle temporary Mayor, with a separate origin and insertion of it. But the description of the find does not correspond fully to any mentioned in the literature reviewed. It corresponds to a temporary issue or muscle not described to date.

Palabras clave : Dissection; pectoralis major; supernumerary variant.

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