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International Journal of Morphology

On-line version ISSN 0717-9502


CORONADO, Juan Carlos  and  DEL SOL, Mariano. Innervation of the Plantar Interossei Muscles of the Human Foot. Int. J. Morphol. [online]. 2010, vol.28, n.4, pp.999-1002. ISSN 0717-9502.

There are three plantar interossei muscles located in the deep plane of the plantar region of the foot. These originate in the base of the metatarsals and adjacent ligaments insert in the base of the third, fourth and fifth phalanges and extensor aponeurosis of the toes. The literature does not include details of the innervation of the plantar interossei muscles. Therefore we carried out an anatomical study of the subject matter. Twentyone feet, six right feet and fifteen left feet of adult individuals of both sexes and different ethnic groups, belonging to the Human Anatomy Units of the Faculty of Medicine of the Universidad de La Frontera and Universidad Mayor Temuco campus, were dissected in cadavers formolized at 10%. The division of the lateral plantar nerve in superficial and deep branches occurs at the level of the lateral margin of the plantar muscle. The plantar interossei muscles receive their innervation from the deep branch, which originate in the middle tertium of the plantar region, crossing inferior to the lateral plantar artery and are anterolaterally aimed toward these muscles. The longitude of the nerve branches for the third and second interossei muscle are similar (X=12.19mm and X= 11.62 mm, respectivelly) and differ from the first interossei muscle (=21.95 mm). These results allow standardization of the distribution and longitude of the nerve branches for the plantar interossei muscles, contributing to anatomical information of the plantar region.

Keywords : Foot; Innervation; Plantar interossei muscles.

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