. . . "0"^^ . "splenius"@en-us . . "105575743"^^ . . . "splenius"^^ . "05575743-n"^^ . "splenius muscle"@en-us . . . . "0"^^ . . "either of two flat muscles that extend from the upper vertebrae to the base of the skull and serve to rotate or flex or extend the head and neck"@en-us . .