Variability of the origin area of the M. spinalis et semispinalis capitis muscles and shape of insertion tendon for members of subfamily Epictinae.

Symbols and abbreviations: 1 = posterior limit of M. semispinalis tendon; 2 = posterior limit of the M. spinalis capitis fibers along the M. semispinalis tendon; 3 = area of insertion of the M. semispinalis capitis; 4 = shape of the M. spinalis et semispinalis capitis tendon of iinsertion; “V” = vertebrae of origin where V1 = atlas, V2 = axis, V3 = first thoracolombar vertebra and so on.