Frontal plane ( Horsley & Clarke, 1908 ) : A synonym for transverse plane (Henle, 1855), commonly used in comparative anatomy. Horsley & Clarke (1908, p. 52) adopted this terminology for use in a stereotaxic instrument and it was adopted for mammals in general, especially in atlases. Also see frontal plane (Henle, 1855).

Horizontal plane ( Horsley & Clarke, 1908 ) : A synonym for frontal plane (Henle, 1855), commonly used in comparative anatomy. Horsley & Clarke (1908, p. 52) adopted this terminology for use in a stereotaxic instrument and it was adopted for mammals in general, especially in atlases. Also see horizontal plane (Henle, 1855).