Two distributions of axons in the optic nerve of quails: a study of nerve degeneraron after láser lesions of the retina
Order in the optic pathway has been under cióse scrutiny since the last century. In fishes, the position of the axons along the optic nerve is a function of the position or of the age of the corresponding neu- ronal body in the retina5’12’13. However, in cats, optic axons only show a crude retinotopic order8. Our observations in the quail showed the existence of at least two kinds of axons according to their position in the optic nerve. Although some axons were found in cióse spatial relationship with others originating in the same región of the retina, other axons occupied positions independent of their site of origin in the retina.