One of the mysteries of the English language finally explained.
Either of the two layers of the retina separated by the inner nuclear layer, the outer one containing synapses between the rods and cones and the neurons of the nuclear layer, and the inner one containing synapses between these neurons and ganglion cells; also called molecular layer.
Mid 19th century; earliest use found in Quain's Elements of Anatomy. After French couche plexiforme ( externe, interne).
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