It remains to discuss the equivalents of the sensory or afferent and the motor or efferent neurons.
Additionally, the presence of melatonin receptor protein on putative retinal efferent fibers suggests a role for melatonin in the central control of retinal sensitivity.
The efferent limb is in resistance arterioles and consists of sympathetically mediated vasoconstriction.
Although centrifugal innervation of the primate retina has not been established, some morphological studies suggest the presence of efferent fibers in monkey and human retina.
We find it difficult to escape the conclusion from these considerations that even basic aspects of visual perception must have a strong "efferent" aspect.
The efferent limb comprises sympathetic nerves to the heart, vasculature and cardiac vagus nerve.
These depend on, among other things, explicit efferent and afferent transmissions with respect to an emulator process.
These circuits provide means to alter or adjust behavior via afferent and efferent connections within the prefrontal cortex.
