What is the neural pathway responsible for accommodation reaction?
Accommodation reflex is the reflex also known as convergence reflex. Eye focuses on near objects by constricting or dilates for objects far away. The lens changes its thickness and size. The pathway includes cranial nerve II for afferent fibers, superior centers and cranial nerve III for efferent limb. Light stimulus is taken to occipital lobe via optic nerve and optic radiation (after they synapse in the geniculate body of posterior thalamus). That stimulus is interpreted as vision. Area 19 in brain is the one that interprets accommodation reflex and responds via Edinger-Westphal nucleus, cranial nerve III to ciliary muscle and sphincter pupilae muscle which produces reflex.