SciELO - Scientific Electronic Library Online

vol.27 número4Arco Axilar de Langer (Músculo Axilopectoral): Variante Supernumeraria Inusual del Músculo Latísimo del Dorso. Reporte de Tres CasosVariación del Sexo en la Aparición del Miocardio en Cúspides de la Válvula Mitral Humana índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados




Links relacionados


International Journal of Morphology

versión On-line ISSN 0717-9502


DHURIA, Ruchi et al. Unilateral Quadripartite Composition of Pectoral Major Muscle: Anatomical Description and Clinical Implications. Int. J. Morphol. [online]. 2009, vol.27, n.4, pp.1213-1216. ISSN 0717-9502.

A unilateral anomalous disposition of the muscular slips of pectoralis major was observed in an adult male cadaver during routine gross anatomy teaching session. The pectoralis major muscle displayed unusual configuration and comprised of four parts delineated by three intramuscular clefts. Further, the sternocostal part was found to divide into two fasciculi. The origin and insertion of pectoralis major muscle was as usual and unremarkable. Interestingly, the innervation of the muscle was observed to bear an important variation. The clavicular and sternocostal slips of pectoralis major muscle received a direct branch from the lateral cord of brachial plexus in addition to its usual innervation from the lateral and medial pectoral nerves. The multiplicity of innervation of pectoralis major as encountered in the present study would presumably augment its suitability for its use in reconstructive procedures. An additional anomalous attachment of the pectoralis minor muscle was also observed emanating from the second rib, apart from the usual third, fourth and fifth ribs. These variants of the pectoral muscles may also have implications in biomechanical studies, as they may alter the kinematics.

Palabras clave : Pectoralis major muscle; Muscle; Anomaly; Innervation.

        · resumen en Español     · texto en Inglés     · Inglés ( pdf )


Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons