Westphal nucleus (accessory oculomotor nucleus) is the parasympathetic pre-ganglionic nucleus that innervates the iris sphincter muscle and the ciliary muscle.
Westphal nucleus (accessory oculomotor nucleus) is the parasympathetic pre-ganglionic nucleus. This parasympathetic pre-ganglionic nucleus innervates the iris sphincter muscle. This parasympathetic pre-ganglionic nucleus innervates the ciliary muscle.