title: Evidence for putative photoreceptor axon terminals in the medulla externa of the crayfish.
mesh_terms: D000818:Animals; D003400:Astacoidea / Q000033:anatomy & histology*; D001369:Axons / Q000648:ultrastructure*; D005123:Eye / Q000033:anatomy & histology*; D002479:Inclusion Bodies / Q000648:ultrastructure; D010786:Photoreceptor Cells / Q000648:ultrastructure*; D013569:Synapses / Q000648:ultrastructure*