Principles of axonal collateralization of laminae II-III pyramids in area 17 of squirrel monkey: a quantitative Golgi study.
The rapid Golgi method was employed to study area 17 of infant squirrel monkeys in order to obtain quantitative data on the number and laminar origin of axon collaterals of pyramidal cells, the somata of which reside in laminae II-III. Counts of axon collaterals were made only on pyramidal cells with apical dendrites that could be followed by lamina I and axons that could be followed to the white matter. A total of 115 pyramidal neurons met these criteria. The data revealed that the descending axons of pyramidal cells in laminae II-III give off an average of 3 collaterals in laminae II-III and 3 collaterals in lamina V; no collaterals are given off in other laminae.
D000818:Animals; D001369:Axons / Q000648:ultrastructure*; D003712:Dendrites / Q000648:ultrastructure; D009474:Neurons / Q000648:ultrastructure; D012453:Saimiri; D013569:Synapses / Q000648:ultrastructure; D014793:Visual Cortex / Q000033:anatomy & histology*; D014795:Visual Pathways / Q000033:anatomy & histology