title: Stratification and square pattern arrangements in the dorsal inner plexiform layer in the retina of Callionymus lyra L.
abstract: The dorsal inner plexiform layer in the retina of Callionymus lyra consists of successive fibrous F layers and geometrically organized P layers. In the F layers no pattern arrangement of the bipolar synaptic buttons was observed. In the P layers, on the contrary, the bipolar synaptic buttons are grouped by three distinct square patterns. The alpha pattern measures 5 micron and corresponds to the square pattern of the photoreceptor cells. The beta and the gamma pattern measure 7 micron. One of both patterns corresponds to the single cone arrangement, while the other coincides with the crossings of the rows of double cone pairs. The alternation of F and P layers results in the stratified appearance of the inner plexiform layer.
mesh_terms: D000818:Animals; D005399:Fishes / Q000033:anatomy & histology*; D008854:Microscopy, Electron; D012160:Retina / Q000648:ultrastructure*