Dissection of the Head and Neck Two glass plate negatives of Lockhart's dissection of the head and neck (cross section, hanging in anatomical display case). One negative and two prints (identical) of Lockhart's dissection of the head and neck (cross section), annotated to show 'cerebral, spinal and sympathetic nerves in human head and neck.' Mounted photograph and negative of G.S. Cameron's illustration of Lockhart's dissection of the head and neck (cross section). The envelope in which the photograph was originally stored was dated 14 December 1949: it is not known if this refers to the date that the drawing was made or the date that it was photographed. c 1920 - 1949