Sensory nerve centers is where nerve vibration is identified. A sensory nerve is an efferent nerve, one which transfers peripheral impressions to the sensoria, sense-centers. Sensory ganglia are those masses of nervous substance which are thought to serve as a center of nervous influence. The most prominent of the sensory nerves are those of the olfactory, optic, auditory, gustatory, tactile and thermal. To these should be added that of cenesthesia, conscious existence, painful or pleasurable, depression or exaltation, the general sense of bodily, or self-existence, the subconscious sensation by the functioning of the internal organs.
Sensory impressions are the effects of external agents or bodies upon the organs of sense.
These external agents or bodies are always the same, impulses as originated are always perfect, if the nervous system is in a normal condition, the impressions, afferent impulses, can not be otherwise than normal. We have the spiritual and physical impulses, those from the creator and the mind. All efferent impulses are motor. All motor impulses, whether of the spirit or the mind, are normal, providing the nerves of transmission are of normal tension. All thoughts, orders, commands, directions of the mind, known as impulses, are normal if voluntary, the lines of communication are normal.