This can be considered to consist almost entirely of visceral motor nerves supplying cardiac muscle, smooth muscle and glandular tissue (including the liver and pancreas) of all the internal organs and of blood vessels.
Control of the system is unconscious - an animal WF
does not have to push fooften work together. The receptor cells arc rod-shaped bipolar neurons which are distributed throughout the mucosa covering the caudal pari of Ihe nasal cavities and the turbinate bones.
The axon leaving each receptor cel)
Fig. 5. Il Outline of the autonomic nervous system. (Repnntcd from Clinical Anatomy and Physiology for Veterinary Technicians, T CoMIIe and JM Basscttp 156, Copynght 2002. with permission from Elscvter Sc∙encc.)
combines with other axons to form the olfactory nerve fibres (II. Chemicals responsible for smell dissolve in the mucus of (he nasal cavity and stimulate the production of nerve impulses. These are transmitted along the olfactory nerve Iibres1 through the cribriform plate of the ethmoid bone (dividing the nasal and cranial cavities) and into the olfactory bulbs of the forebrain, where they are interpreted as smell.