This work investigates the brain of Polish fowl by means of light microscop
y and documents the results after comparing them to the homolog structures
in the brains of breeds with an unaltered CNS anatomy (Arauka und Bankiva).
It became evident, that the primary changes in the brain of the crested fow
l were caused by a change in the direction of growth of the palaeostriatal
complex from caudal to dorsorostral. It resulted in extreme changes of the
Additionally one finds a great distension of the third as well as the later
al ventricles caused by the internal hydrocephalus.