The placement of the major ampullate gland spigots relative
to the piriform gland spigots is scored as Character 81,
MaAmp field invagination; (0) MaAmp field on the mesal margin
of the anterior lateral spinneret spinning field; (1) MaAmp
field partially invaginated within Pi field, MaAmp spigots in a
transversal line, with one of the MaAmp spigots still close to
the mesal margin; (2) MaAmp field well invaginated within Pi
field, MaAmp spigots in a longitudinal line.