11.   A nerve is a collection of nerve fibres inside a coat of connective tissue.

12.   Nerve fibres do not carry sensations, i.e. cold, sweet, yellow.

13.   An impulse passing along a nerve fibre is in some respects similar to an electric pulse passing along a wire.

14.   Although nerve fibres are abundant in the liver, particularly in the portal triads, their metabolic importance remains obscure.

15.   All nerve fibres and terminals present seemed normal in number and morphology.

16.   The autonomic connections between the enteric and central nervous systems are well known, and the vagus and sympathetic nerves carry more afferent than efferent nerve fibres.

17.   And in the retina of the eye, specific G-proteins convert light signals to activation of the nerve fibres that convey visual stability to the brain.

18.   The protein works via a receptor called Nogo, located in myelin, the fatty sheath that surrounds nerve fibres.