(astronomy) One of the satellites of the planet Neptune

(physiology) The signal transmitted along a nerve fibre, either in response to a stimulus (such as touch, pain or heat), or as an instruction (such as causing a muscle to contract).

(neuroanatomy) In vertebrates, that part of the nervous system comprising the brain, brainstem and spinal cord.

(cytology) A cell of the nervous system which conducts nerve impulses; a neuron.

An organ system that coordinates the activities of muscles, monitors organs, constructs and processes data received from the senses, and initiates actions.

(neuroanatomy) The part of the nervous system which is not the central nervous system.

(neuroanatomy) In humans and other vertebrates, the part of the nervous system that regulates the involuntary activity of the heart, intestines and glands. These activities include digestion, respiration, perspiration, metabolism, and the modulation of blood pressure.

(neuroanatomy) Any of the twelve paired nerves that originate from the brainstem or base of the brain instead of the spinal cord.

(Irish mythology) A warrior of Connacht in the Ulster Cycle of Irish mythology.

(neuroanatomy) Either of the tenth pair of cranial nerves which extend from the medulla oblongata down into the abdomen. Branches of these important nerves supply the tongue, larynx, lungs, gut, and heart.