Number of fibres in the optic nerve and the number of ganglion cells in the retina of anurans.
D001001:Anura; D005123:Eye; D009474:Neurons; D009900:Optic Nerve / Q000033:anatomy & histology*; D012160:Retina / Q000033:anatomy & histology*
NERVES, OPTIC/anatomy and histology; RETINA/anatomy and histology