myotome

(biology, medicine) In vertebrate embryonic development, a group of tissues formed from any particular one of the somites that develop into the body wall muscle. .

(biology, medicine) In neurology, a group of muscles innervated from a particular spinal segment; the division of innervation reflects the embryology of the various somites. Compare: dermatome.

(biology, medicine) A surgical instrument for performing myotomy.